CN212907020U - RGB type LED drive IC device - Google Patents

Abstract

The utility model relates to a RGB type LED drive IC device, which is used for indoor and outdoor LED display screens and decorative LED lighting systems and comprises an input control module, a PWM comparator, a PWM counter and a gray data latch, wherein the gray data latch latches sampled gray data when the existence of a clock CKI signal is not detected; the device also comprises a gray data shift register, an internal oscillator unit, a reference voltage source part and a clock data automatic alignment circuit module; three programmable constant current drivers are also included to drive the external LED strings in constant current and constant voltage modes. The utility model discloses be favorable to extending range of application and furthest's the reduce system cost to can be fit for being used for low-cost LED to decorate lighting system.

Description

RGB type LED drive IC device

Technical Field

The utility model relates to a LED driver IC technical field especially relates to a can be applied to RGB type LED driver IC device of LED display screen and decorative LED illumination brightening system.

Background

In the technical field of LEDs, RGB lamps form images by common intersection of three primary colors, and blue LEDs are matched with yellow fluorescent powder and purple LEDs are matched with RGB fluorescent powder, and the two types of lamps have imaging principles integrally. Therefore, the white light LED and the RGB LED both have a special purpose, and it is desired to achieve the effect of white light, but one is directly presented by white light, and the other is formed by mixing red, green and blue light. For example, some LED backlights have a clear and vivid color, even with high-definition television, which is the feature of RGB, and have more diversified characteristics in light color mixing.

In application, RGB is obviously diversified compared with a white light LED, such as a car light, a traffic sign, a shop window, etc., when a light with a certain wavelength band is needed, color mixing of RGB can be freely performed, and in contrast, the white light LED is relatively deficient, and the definition and color purity of the white light LED are obviously inferior to those of RGB, so that the RGB lamp becomes more advantageous.

Although the RGB LED lamp shows great advantages, the present invention discloses a technical solution of the present invention, after the research personnel analyzes the previous RGB LED device, it is found that the problem of most of the current RGB LED lamps in control still needs to be strengthened, especially when the LED device chip is applied to the current LED display screen and the decorative LED lighting system, because the function of its own RGB LED driving IC chip is limited, in most cases, only one power supply mode can be supported, and the application is not flexible, the output polarity is fixed, the cascade function is poor, the power consumption of the cascade process is large and the work is unstable; obviously, for the functions of the RGB LED driving IC chip, the bottleneck stage of the rapid development of LED display and LED lighting industry has been reached, which is mainly shown in that the existing RGB LED driving IC chip is not suitable for being applied to the state of the output power supply voltage higher than 5.5V, the constant voltage/current driving mode, and the high-power high-brightness LED driving state.

Therefore, the technical scheme of the utility model also in order to overcome above drawback, need rationally optimize the functional module of RGB type LED drive IC chip to in can extend range of application and furthest's reduce system cost, and can be fit for being used for low-cost LED and decorate lighting system. Certainly, the utility model discloses technical scheme's research and development personnel are after the drawback of RGB type LED drive IC chip in the past is gone out in the analysis, with the effectual integration and many times capability test of middle scheme that each test research and development stage took, finally do benefit to and obtain the utility model discloses the technical scheme who tends to the best optimization.

To sum up, the utility model discloses just on current well-known technique's basis, in order to satisfy the practical application demand in IC chip field, to the drive IC in this technical field propose further research and development, propose a RGB type LED drive IC device, its use is nimble and do benefit to the stability that improves work operation. The proposed solution thus enables to alleviate, partially solve or completely solve the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above-mentioned problem or solve or alleviate and solve the above-mentioned problem at least partially, the utility model provides a RGB type LED drive IC device, its be convenient for extend range of application and furthest's reduction system cost to can be fit for being used for low-cost LED decoration lighting system.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an RGB type LED driving IC device for an indoor and outdoor LED display screen and a decorative LED lighting system, the LED driving IC device comprising:

the input control module is arranged in the LED drive IC and is connected with the POL connecting end and the CKM connecting end;

the PWM comparator is connected with the input control module and respectively connected with the PWM counter and the gray data latch, and the gray data latch latches the sampled gray data when the clock CKI signal is not detected;

a gray data shift register connected to the gray data latch and storing the data signal of the serial data input port SDI;

an internal oscillator unit connected with the PWM counter;

a reference voltage source section connected to the internal oscillator unit;

the clock data automatic alignment circuit module is connected with the gray data shift register;

the three programmable constant current drivers are connected with the PWM comparator and the reference voltage source part, each constant current driver comprises a group of connecting ends which are respectively a ROUT connecting end and an RFB connecting end, a GOUT connecting end and a GFB connecting end, and a BOUT connecting end and a BFB connecting end in sequence, and the programmable constant current drivers drive external LED strings in constant current and constant voltage modes.

In combination with the above technical solutions of the present invention, the technical solution can be further defined or supplemented by the technical personnel in combination with the actual requirements, and the technical means for defining or supplementing can include any one of the following:

for the RGB type LED driving IC, serial data input from SDI data is read into a gray scale data shift register in a chip at the rising edge of a clock signal of a CKI port, and the input clock signal and an LED gray scale control signal are output at CKO and SDO ends after being shaped by a clock data automatic alignment circuit module in the chip.

For each constant current driver, an independent output driving channel can be formed, each channel adopts independent 256-level PWM gray scale control, and 256-level LED gray scale control is realized under the condition of not changing the LED light-emitting color, and constant LED driving current is output.

When combined with a specific application, a skilled person can also obtain a corresponding technical scheme, including:

for the chip of the RGB type LED driving IC device, if the periphery of the chip is connected with an RS element, a D0 element and a C0 element, the RGB type LED driving IC device with high input voltage is formed;

further, when the signal transmission frequency is higher than 2MHz, a ceramic capacitor of 300nF is connected in parallel at the position of the C0 element, and is used for stabilizing the signal transmission.

For a chip of an RGB type LED driving IC device, if the chip uses a high performance operational amplifier to control the transistor M0 to generate a constant current, the constant current drives an LED string externally connected to the chip, thereby forming an RGB type LED driving IC device in a constant current driving mode.

For a chip of the RGB type LED drive IC device, if pins RFB, GFB and BFB of the chip are directly short-circuited with GND, the RGB type LED drive IC device with a constant voltage drive mode is formed.

For the RGB type LED driving IC device, if a switch is connected outside the RGB type LED driving IC device, the RGB type LED driving IC device is used for driving a high-brightness LED in a constant voltage driving mode and simultaneously realizing 256-level gray control of the high-brightness LED.

By the above technical solution, the skilled person can further implement any of the following:

the chip of the RGB type LED driving IC device comprises a VCC pin, a CKO pin, an SDO pin, an NC pin, an ROUT pin, a GOUT pin, a BOUT pin, a CKI pin, an SDI pin, a POL pin, an RFB pin, a GFB pin, a BFB pin and a GND pin.

In addition, the clock data automatic alignment circuit module automatically aligns internal data and a clock.

The utility model discloses a rationally set up input control module, PWM comparator, PWM counter, grey scale data latch, internal oscillator unit, grey scale data shift register, reference voltage source part and clock data automatic alignment circuit module, be favorable to extending range of application and furthest's reduce system cost to can be fit for being used for low-cost LED to decorate lighting system.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a functional module of a circuit chip of an RGB LED driver IC device implemented in the present invention;

FIG. 2 is a schematic diagram of the circuit chip pins of an RGB LED driver IC device implemented in accordance with the present invention;

fig. 3 is a schematic diagram illustrating the connection of the RGB LED driver IC applied to the circuit portion for reference when the output power voltage is higher than 5.5V according to the present invention;

fig. 4 is a schematic diagram of a circuit portion connection diagram for reference, which is illustrated in a constant voltage driving mode or a constant current driving mode state, of an RGB LED driver IC device implemented by the present invention;

FIG. 5 is a schematic diagram of a RGB LED driver IC device implemented by the present invention, applied to a reference circuit portion illustrated in a high power and high brightness LED driving state;

fig. 6 is a schematic diagram of the RGB LED driver IC implemented by the present invention, which illustrates the connection of the circuit portion for reference when the external switch is used to realize the high-voltage constant-current LED string state.

Detailed Description

The utility model discloses the RGB type LED driver IC device of wanting to implement, the aim at that the technical means of implementing will reach, overcome the limitation of the application that used in the past RGB LED driver IC piece exposed when being applied to output power supply voltage and being higher than 5.5V, constant voltage/current drive mode and states such as high-power high brightness LED drive to used RGB LED driver IC piece neither does benefit to the lowering system cost in the past, does not also do benefit to the stability of lift system.

The utility model discloses the technical scheme who implements, the reasonable setting of each circuit module of mainly through RGB type LED drive IC piece realizes its flexibility of using, because the condition that LED drive IC piece was used is different with the demand of founding IC chip module, the scope that relates is wider, it is not the utility model discloses conventional technical means within the technical scheme scope, for example, the model of every small components and parts in the circuit, irrelevant component, connected mode, the material object connection between the wire etc. are refine out to this embodiment, for example, connection between the circuit obviously adopts conventional technical means, technical staff obviously can select suitable position to install each circuit module according to the drive IC piece, each module of IC can adopt conventional technical means to encapsulate etc. after the overall arrangement is accomplished. Therefore, the implemented technical solution is actually a module layout of an RGB type LED driving IC chip that can be referred and implemented by a person skilled in the art by combining with conventional technical means, and the person skilled in the art can debug each module layout of the IC chip formed according to the present application according to different application conditions and design requirements, so as to construct a final RGB type LED driving IC device structure, and a series of advantages are actually obtained by the constructed device structure, and these advantages will be gradually reflected in the following analysis of the system structure.

Further, for the RGB LED driver IC device to be implemented, a technician can configure the pins and package the LED device externally according to the common knowledge in the art, and the size and shape of the IC chip can be determined according to the requirements of the designer, for example, the configured pins can be set up several pins according to the different types of chips or different types of designs, therefore, the number of pins and the technical means adopted by the package do not belong to the technical solution of the present invention.

Example one

As shown in fig. 1-2, the utility model discloses the RGB type LED drive IC device of planning to implement to its appearance structure, the technical staff can select to design its IC piece into a plurality of pins, including VCC pin, CKO pin, SDO pin, NC pin, ROUT pin, GOUT pin, BOUT pin, CKI pin, SDI pin, POL pin, RFB pin, GFB pin, BFB pin, GND pin.

The internal function module of the LED driving IC device comprises an input control module, a PWM comparator, a PWM counter and a gray data latch, an internal oscillator unit and a gray data shift register, wherein the PWM comparator is connected with the input control module;

correspondingly, the implemented internal oscillator unit is connected with the reference voltage source part, and the implemented gray data shift register is connected with the clock data automatic alignment circuit module;

further, for the implemented PWM comparator, it is connected with three programmable constant current drivers, each constant current driver includes a group of connection ends, which are respectively the ROUT connection end and the RFB connection end, the GOUT connection end and the GFB connection end, and the BOUT connection end and the BFB connection end in turn;

meanwhile, each of the constant current drivers is connected to a reference voltage source section.

Further, for the implemented input control module, a POL connection end and a CKM connection end are connected, and the two connection ports are connected into the connection ports of the three constant current drivers;

further, for the implemented gray scale data shift register, it is connected with CKI connecting end and SDI connecting end, wherein CKI connecting end is connected with CKM connecting end, wherein SDI connecting end is connected with SDO connecting end of the clock data automatic alignment circuit module.

Above the RGB type LED driving IC device implemented by the present invention, when in operation, the rising edge of the input clock samples the data signal of the serial data input port SDI, and stores it in the internal gray data shift register;

when the existence of the clock CKI signal is not detected within continuous 1ms, the gray data sampled previously is latched into the gray data latch, and an internal register is refreshed at the same time to prepare for the next data transmission;

wherein the programmable constant current drivers are capable of driving external LED strings in constant current and constant voltage modes, and through the extension of peripheral circuits, these drivers are capable of driving LED strings in constant voltage or current mode at high input voltages;

the clock data automatic alignment circuit module can automatically align internal data and a clock, and an internal push-pull output stage has strong driving capability so as to meet the requirement of cascade application of the internal push-pull output stage.

Above the utility model discloses the RGB type LED drive IC device that implements, when using, wherein constant current LED driver mainly designs for indoor/outer LED display screen and decorative LED lighting system, is particularly suitable for being used for the LED lighting system that needs the relay to concatenate, possess three independent output drive passageway, and 256 grades of PWM grey scale control that independent can be realized to every passageway, can realize 256 grades of LED grey scale control under the condition that does not change LED luminous color, and can output the constant LED drive current up to 200 mA; serial data input from SDI data are read into a gray data shift register in a chip at the rising edge of a clock signal of a CKI port, and the input clock signal and an LED gray control signal are output at CKO and SDO ends after being shaped by a clock data automatic alignment circuit module in the chip, so that the chips can be connected in series in relay; when POL is equal to 0', the output polarity is reversed, the PWM controller works like a PWM controller, an external switch or circuit can be driven to drive a high-brightness LED, and 256-level gray level control of the high-power LED is realized; the utility model discloses the RGB type LED drive IC device that implements, when being used for general LED illumination decoration system very much, can demonstrate characteristics such as fast, the reliability is high, grey scale data refreshes in step, does benefit to furthest's reduce system cost, is fit for being used for low-cost LED decoration lighting system equally also.

Example two

As shown in fig. 3, the RGB LED driver IC device to be implemented in the present invention is applied to a high input voltage state, the chip periphery is connected to RS, D0, C0, thereby forming a high input voltage RGB LED driver IC device, the operating power voltage range of which is 3.3-5.5V, when the output power voltage is higher than 5.5V, a zener diode D0 is connected to clamp the power generated by the power voltage, under a normal operating condition, the chip consumes about 1.5mA of current, the current flowing through the current limiting resistor RS should be at least 2 times of the chip consumed current and about 3mA of current to ensure normal operation, if the input power voltage is 12V, then RS 2K can satisfy the application; in addition, a capacitor C0 connected to ground is connected to the power supply by a technician to filter noise on the power supply, C0 ═ 10uF is satisfactory for most applications, and when a PCB is manufactured, C0 should be as close to VCC pin as possible.

In addition, when the signal transmission frequency is higher than 2MHz, the technician may connect a ceramic capacitor of about 300nF in parallel at C0 to make the signal transmission more stable.

EXAMPLE III

As shown in fig. 4, when the RGB LED driver IC device to be implemented in the present invention is applied to the constant current driving mode, a high performance operational amplifier is used to control the transistor M0 to generate a constant current, so that the constant current drives the LED string externally connected to the chip, and the output current of each driving channel can be programmed and set independently by an external current feedback resistor, as shown in fig. 3, XFB is RFB/GFB/BFB, wherein VREF is 0.75V, and RXFB is the current feedback resistor connected to the pin RRFB/RGFB/RBFB, for example, if the current required for driving the LED is 20mA, RXFB is 39 Ω RXFB.

In order to ensure the normal work of the constant current driver, the voltage of the R/G/BOUT pin is set between 1V and 1.5V when the constant current driver works normally, so that a high-precision driving current can be output in the whole working range; if the voltage of the R/G/BOUT is too low, the internal driving circuit may not operate normally and cannot output the current required for driving, and if the voltage of the R/G/BOUT is too high, the internal driving circuit may consume too much power on the chip, thereby reducing the stability of the circuit operation.

The utility model discloses the RGB type LED that plans the implementation drives IC device, not only can provide constant current drive mode for the user, also can provide constant voltage drive mode, can supply constant voltage drive mode to refer to as shown in FIG. 4, compatible ZQL9712 under this mode, under constant voltage drive mode, drive output voltage height 50 mA; when the constant voltage driving circuit is applied, the R/G/BFB pin can work in a constant voltage driving mode only by directly short-circuiting the R/G/BFB pin with GND.

Example four

As shown in fig. 5, the utility model discloses the RGB type LED that plans to implement drives IC device, when being applied to the LED drive state of high-power hi-lite, usable external switch drives high bright LED under constant voltage drive mode, realizes high bright LED's 256 grades of grey controls simultaneously, when POL ═ LOW ", the output polarity reverses, works like a PWM controller this moment, the PWM control signal that its produced can be used to control outside high-power LED constant current driver or NPN BJT switch transistor in order to drive LED.

EXAMPLE five

As shown in fig. 6, the utility model discloses the RGB type LED drive IC device of planning to implement, when adopting external switch to realize high-pressure constant current drive LED cluster state, be favorable to realizing LED's series drive with very low cost under the condition of high mains voltage input through external switch, this mode can be used to drive the LED cluster under high input voltage mode, and NPN pipe work is in the linear region this moment, and the highest applied voltage depends on the withstand voltage of external NPN triode.

In the description herein, the appearances of the phrases "embodiment one," "this embodiment," "specific implementation," and the like in connection with the description herein are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention or inventions. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example; furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present application, the terms "connect", "mount", "fix", "set", "have", etc. are used in a broad sense, for example, the term "connect" may be a fixed connection or an indirect connection through intermediate components without affecting the relationship and technical effects of the components, or may be an integral connection or a partial connection, as in this case, for a person skilled in the art, the specific meaning of the above terms in the present application may be understood according to specific situations.

The foregoing description of the embodiments is provided to enable any person skilled in the art to make and use the embodiments, and it is to be understood that various modifications may be readily apparent to those skilled in the art, and that the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present disclosure is not limited to the above embodiments, and modifications to the following cases should be included within the scope of the present disclosure: firstly, the technical proposal of the utility model is that an input control module, a PWM comparator, a PWM counter, a gray data latch, an internal oscillator unit and a RGB type LED drive IC device composed of a gray data shift register are combined with a new technical proposal implemented by the prior common general knowledge, and the technical effect produced by the new technical proposal is not beyond the technical effect of the utility model; secondly, equivalent replacement of part of the characteristics of the technical scheme of the utility model by adopting the known technology, for example, replacement of electronic components, circuit elements and the like which can be replaced and implemented, and the generated technical effect is the same as the technical effect of the utility model; thirdly, the technical scheme of the utility model is expanded on the basis, and the essential content of the expanded technical scheme does not exceed the technical scheme of the utility model; and fourthly, the technical means obtained by utilizing the equivalent transformation made by the text record content of the utility model is applied to other related technical fields.

Claims (10)

1. An LED drive IC device of RGB type for indoor and outdoor LED display screens and decorative LED lighting system, comprising:

the input control module is arranged in the LED drive IC and is connected with the POL connecting end and the CKM connecting end;

the PWM comparator is connected with the input control module and respectively connected with the PWM counter and the gray data latch, and the gray data latch latches the sampled gray data when the existence of the clock CKI signal is not detected;

a gray data shift register connected to the gray data latch and storing a data signal of a serial data input port SDI;

an internal oscillator unit connected with the PWM counter;

a reference voltage source part connected with the internal oscillator unit;

the clock data automatic alignment circuit module is connected with the gray data shift register;

and the three programmable constant current drivers are connected with the PWM comparator and the reference voltage source part, each constant current driver comprises a group of connecting ends which are respectively an ROUT connecting end and an RFB connecting end, a GOUT connecting end and a GFB connecting end, and a BOUT connecting end and a BFB connecting end in sequence, and the programmable constant current drivers drive the external LED strings in a constant current mode and a constant voltage mode.

2. The RGB type LED driving IC device according to claim 1, wherein: for the RGB type LED driving IC, serial data input from SDI data is read into a gray scale data shift register in a chip at the rising edge of a clock signal of a CKI port, and the input clock signal and an LED gray scale control signal are output at CKO and SDO ends after being shaped by a clock data automatic alignment circuit module in the chip.

3. The RGB type LED driving IC device according to claim 1, wherein: each constant current driver forms an independent output driving channel, each channel adopts independent 256-level PWM gray scale control, the 256-level LED gray scale control is realized under the condition that the LED light-emitting color is not changed, and the constant LED driving current is output.

4. The RGB type LED driving IC device according to any one of claims 1 to 3, wherein: the periphery of a chip of the RGB type LED driving IC device is connected with an RS element, a D0 element and a C0 element, so that the high-input-voltage RGB type LED driving IC device is formed.

5. The RGB type LED driving IC device according to claim 4, wherein: when the signal transmission frequency is higher than 2MHz, a ceramic capacitor of 300nF is connected in parallel at the position of the C0 element and used for stabilizing the signal transmission.

6. The RGB type LED driving IC device according to any one of claims 1 to 3, wherein: the chip of the RGB type LED driving IC device adopts a high-performance operational amplifier to control a transistor M0 to generate a constant current, and the constant current is used for driving an LED string externally connected with the chip to form the RGB type LED driving IC device in a constant current driving mode.

7. The RGB type LED driving IC device according to any one of claims 1 to 3, wherein: RFB, GFB and BFB pins of a chip of the RGB type LED drive IC device are directly in short circuit with GND, and the RGB type LED drive IC device in a constant voltage drive mode is formed.

8. The RGB type LED driving IC device according to claim 1, wherein: the RGB type LED driving IC device is externally connected with a switch and used for driving the high-brightness LED in a constant voltage driving mode and simultaneously realizing 256-level gray level control of the high-brightness LED.

9. The RGB type LED driving IC device according to claim 1, wherein: the chip of the RGB type LED driving IC device comprises a VCC pin, a CKO pin, an SDO pin, an NC pin, an ROUT pin, a GOUT pin, a BOUT pin, a CKI pin, an SDI pin, a POL pin, an RFB pin, a GFB pin, a BFB pin and a GND pin.

10. The RGB type LED driving IC device according to claim 1, wherein: the clock data automatic alignment circuit module automatically aligns internal data and a clock.

Images