CN211580258U - LED drive control circuit and lamp - Google Patents

Abstract

The utility model discloses a LED drive control circuit and lamps and lanterns, circuit include that the signal produces module, data processing module, lamp cluster control module group and cascade module. The signal generating module generates a first control signal for adjusting the gray scale and the current gain of the LED lamp string, the data processing module generates a lamp string control signal according to the first control signal and outputs the lamp string control signal to the lamp string control module, the lamp string control module sets the output current value according to the lamp string control signal, and after the cascade module receives the first control signal output by the signal generating module, the cascade data is output after self-shaping, the output gray scale of the cascade chip is set, the cascade between the DC-DC chips is realized, or the DC-DC chip and the three/four-channel LED constant current driving chip are connected with the handle in a cascade way, the current gain of the DC-DC chip can be adjusted, the color temperature change can be controlled, the display effect tends to be fine and smooth, through parameters such as current gain or gray scale setting of the cascade module read-back circuit, the later maintenance is efficient and convenient.

Description

LED drive control circuit and lamp

Technical Field

The embodiment of the utility model provides a relate to lamps and lanterns technical field, especially a LED drive control circuit and lamps and lanterns.

Background

The LED lamp is an appliance capable of transmitting light, distributing and changing the light distribution of an LED light source, and comprises all parts except the LED light source, which are required for fixing and protecting the LED light source, and circuit accessories which are necessary for connecting with a power supply.

At present, a plurality of switching power supply constant-current driving LED lamp products appear in the market, and are mainly used for landscape decoration lighting, architectural decoration lighting and the like. As shown in fig. 1, the output current of the product in the circuit of the existing LED lamp is mainly set by grounding the RCS resistor through the CS pin of the chip, and the output current value is a fixed value due to the fixed resistance of the RCS resistor, so that the existing LED lamp product is limited in the application process, and if the output current does not meet the field application requirement, the RCS resistor needs to be replaced again, which is cumbersome to operate and long in operation time; or the output current is regulated through the PWM signal, and an external chip is required to generate the PWM signal, so that the cost is increased; in addition, this series of product lamps and lanterns can't concatenate the signal and cascade the hand power and use, also can't cooperate the transcoding chip, give the rear end chip with transcoding agreement transmission for it carries out display effect control, and the effect is given priority to the monochromatic, and the display effect is too single.

SUMMERY OF THE UTILITY MODEL

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

The utility model discloses a first aspect provides a LED drive control circuit, include:

the signal generating module is used for generating a first control signal, wherein the first control signal is used for adjusting the gray scale and the current gain of the LED lamp string;

the data processing module is connected with the signal generating module and used for generating a lamp string control signal according to the first control signal;

the light string control module is connected with the data processing module and used for adjusting the gray scale and the current of the LED light string according to the light string control signal;

and the cascade module is connected with the signal generation module and used for outputting cascade data and receiving a data read-back signal output by an external chip after receiving the first control signal.

Optionally, the signal generating module comprises:

an oscillator for generating a continuous periodic square wave signal;

and the data sampling module is used for receiving the square wave signal to be used as the first control signal to be output to the data processing module after the square wave signal is used for collecting an external signal.

Optionally, the data processing module includes: the current adjusting module is connected with the voltage reference module and the data sampling module and used for generating a current adjusting signal according to a first control signal output by the data sampling module, adjusting a reference voltage output by the voltage reference module and outputting the reference voltage to the lamp string control module;

and the pulse width control color temperature adjusting module is connected with the oscillator and the data sampling module and used for generating a color temperature adjusting signal according to the first control signal output by the data sampling module and outputting the color temperature adjusting signal to the lamp string control module group.

Optionally, the voltage reference module is connected to a CS port of the control chip, and is configured to generate the reference voltage according to the CS port and a ground resistance connected to the CS port.

Optionally, the pulse width control color temperature adjusting module is connected to a DIM port of the control chip, and is configured to generate the color temperature adjusting signal according to a PWM signal input from the DIM port.

Optionally, the light string control module includes:

and the DC-DC module is connected with the current regulation module and the pulse width control color temperature regulation module and is used for receiving and regulating the gray scale and the current of the LED lamp string according to the current regulation signal and the color temperature regulation signal.

Optionally, the light string control module further comprises:

and the over-temperature protection module is connected with the DC-DC module and is used for controlling the output current of the DC-DC module according to the chip temperature.

Optionally, the cascade module comprises:

the data cascading regeneration module is connected with the data sampling module and used for receiving the external signal collected by the data sampling module and then self-shaping the cascading data signal of the external cascading chip to generate cascading data;

and the DOUT driving module is connected with the data cascade regeneration module and is used for outputting the cascade data to the external cascade chip and receiving a data readback signal output by the external cascade chip, wherein the data readback signal is used for reading preset LED lamp string control parameters.

Optionally, the control circuit further comprises:

and the power supply module is connected with an external power supply and used for outputting stable voltage signals to each power utilization unit.

In a second aspect, the present invention further provides a lamp, which includes an LED string and an LED driving control circuit as above.

The utility model discloses beneficial effect does: the signal generating module generates a first control signal for adjusting the gray scale and the current gain of the LED lamp string, the data processing module generates a lamp string control signal according to the first control signal and outputs the lamp string control signal to the lamp string control module, the lamp string control module sets the magnitude of an output current value according to the lamp string control signal, the cascade module receives the first control signal output by the signal generating module, self-shaping is carried out on cascade data to be output, then the shaped cascade data is output, the output gray scale of the cascade chip is set, cascade connection between DC-DC chips is realized, or the DC-DC chip and a three/four-channel LED constant current driving chip are connected, the current gain of the DC-DC chip can be adjusted, the aim of controlling various color temperature changes and leading the display effect to be more fine and smooth is achieved, and parameters such as the current gain or the gray scale setting can be read back through the cascade module, convenient to use, the later maintenance is high-efficient convenient.

Drawings

The above and other features, advantages and aspects of various embodiments of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements. It should be understood that the drawings are schematic and that elements and features are not necessarily drawn to scale.

FIG. 1 is a schematic circuit diagram of an LED lamp in the prior art;

fig. 2 is a schematic diagram of a module according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a module structure according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a circuit structure of chip cascade according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a data communication protocol of a return-to-zero code protocol according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of an embodiment of the present invention illustrating a chip intercepting current gain bit;

fig. 7 is a schematic diagram of a chip-intercept current gain bit according to another embodiment of the present invention.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 2, the present invention provides a LED driving control circuit, including:

the signal generating module 1 is used for generating a first control signal, wherein the first control signal is used for adjusting the gray scale and the current gain of the LED lamp string;

the data processing module 2 is connected with the signal generating module 1 and used for generating a lamp string control signal according to the first control signal;

the lamp string control module 3 is connected with the data processing module 2 and used for adjusting the gray scale and the current of the LED lamp string according to the lamp string control signal;

and the cascade module 4 is connected with the signal generating module 1 and used for outputting cascade data and receiving a data read-back signal output by an external chip after receiving the first control signal.

When implementing, the utility model discloses LED drive control circuit is the drive chip inner circuit of LED lamps and lanterns, fig. 1 is the circuit schematic diagram of switching power supply constant current drive LED lamps and lanterns product among the prior art, wherein, LEDA1 constitutes LED lamp cluster to LEDAN, output current sets up the homepage and adjusts through control chip CS pin butt joint RCS resistance R2 in this circuit, make output current value be the fixed value, just need to change RCS resistance R2 to the use scene of difference, and complex operation uses inconveniently. Fig. 2 is the circuit module schematic diagram of the LED driving control circuit, wherein, the signal generation module 1 is used for generating the first control signal for adjusting the gray scale and the current gain of the LED light string, when implementing, the signal generation module can adopt the demand signal with different gray scales, current magnitude and lighting requirement, and generate the first control signal according to the demand signal, of course, when implementing, the signal generation module can also be according to the signal of external input, for example, the user adjusts the signal of the input according to the lighting brightness of the LED light string according to the use requirement, the circuit generates the first control signal according to the signal.

In the implementation, taking the first control signals with different gray scale requirements provided by the signal generating module as an example, the data processing module 2 processes the first control signals to output 65536 gray scales, or adjusts the output voltage of the RCS resistor R2 to adjust the magnitude of the output current, so that the light string control module 3 controls the gray scales and the current of the LED light string. The RCS resistor R2 does not need to be frequently replaced according to the use scene, and the use is convenient and reliable. The cascade module 4 can output cascade data and receive data read-back signals, wherein the data read-back signals can be used for reading parameters such as current gain and gray scale in the control chip, and the cascade module has the characteristics of high efficiency and convenience for field application and later maintenance.

In this embodiment, a signal generating module 1 generates a first control signal for adjusting the gray scale and current gain of the LED light string, a data processing module 2 generates a light string control signal according to the first control signal and outputs the light string control signal to a light string control module 3, the light string control module 3 sets the magnitude of an output current value according to the light string control signal, a cascade module 4 receives the first control signal output by the signal generating module 3, performs self-shaping on cascade data to be output, outputs the shaped cascade data, sets the output gray scale of the cascade chip, realizes cascade connection between DC-DC chips, or cascade connection between the DC-DC chip and three/four-channel LED constant current driving chips, and adjusts the current gain of the DC-DC chip, so as to control various color temperature changes and achieve the purpose of fine and smooth display effect, and can read back the current gain or gray scale setting of a circuit through the cascade module 4, convenient to use, the later maintenance is high-efficient convenient.

In an alternative embodiment, please refer to fig. 3, fig. 3 is a schematic diagram of a circuit module according to an embodiment of the present invention.

As shown in fig. 3, the signal generating module 1 includes:

an Oscillator (OSC)11, where the oscillator 11 is used for generating a continuous periodic square wave signal;

and the data sampling module 12 is used for receiving the square wave signal to acquire an external signal and then outputting the external signal as the first control signal to the data processing module 2.

In practice, the Oscillator (OSC)11 generates a continuous periodic square wave signal and outputs the square wave signal to the data sampling module 12, and the data sampling module 12 is further connected to the data input port DIN, and in some embodiments, the signal inputted to the data input port DIN includes a current gain bit adjustment signal or a gray scale signal, thereby generating the first control signal.

In some embodiments, the data processing module 2 comprises:

the current adjusting module 21 is connected with the voltage reference module 23 and the data sampling module 12, and is configured to adjust a reference voltage output by the voltage reference module 23 according to a first control signal output by the data sampling module 12 to generate a current adjusting signal and output the current adjusting signal to the light string control module;

and the pulse width control color temperature adjusting module 22, where the pulse width control color temperature adjusting module 22 is connected to the Oscillator (OSC)11 and the data sampling module 12, and is configured to generate a color temperature adjusting signal according to the first control signal output by the data sampling module 12, and output the color temperature adjusting signal to the light string control module 3.

In implementation, the current adjusting module 21 performs adjustment through the first control signal provided by the data sampling module 12 to generate a current adjusting signal to adjust the current of the LED string. The pulse width control color temperature adjusting module 22 processes the control signals with different gray scale requirements provided by the data sampling module 12 through an internal logic control circuit, and outputs 65536-level gray scale (GAMMA correction), so that the display effect tends to be fine and smooth, the refresh rate is as high as 4KHz, and the problem of dark stripes of the shot picture is solved.

In some optional embodiments, the voltage reference module 23 is connected to the CS port of the control chip, and is configured to generate the voltage reference according to the CS port and a ground resistor (RCS resistor R2) connected to the CS port. In implementation, since the resistance value of the RCS resistor is fixed, the current value is a fixed value, and at this time, the function of adjusting the current of the RCS resistor R2 can be realized by adjusting the voltage of the CS port, and the current gain adjustment is to divide the fixed current value into a plurality of output current levels, and each current level can be adjusted by 65536 levels of PWM pulse width. After receiving the current gain adjustment data bit (the first control signal) transmitted by the data sampling module 12, the current adjustment module 21 stores the current gain adjustment data bit in its own module, and retains the original output current setting parameter under the condition of no signal input or no signal input after the chip is powered on again.

In some optional embodiments, the pulse width control color temperature adjusting module 22 is connected to a DIM port of the control chip, and is configured to generate the color temperature adjusting signal according to a PWM signal input from the DIM port.

In implementation, the Oscillator (OSC)11, the data sampling module 12 and the DIM port respectively input a square wave signal, a sampling signal and a PWM signal to the pulse width control color temperature adjusting module 22, and the pulse width control color temperature adjusting module 22 outputs pulse width modulation PWM control signals with different gray scale duty ratios to adjust the gray scale and the current of the light string in an analog or digital logic processing manner.

In some optional embodiments, the light string control module 3 includes:

and the DC-DC module 31, the DC-DC module 31 is connected with the current regulation module 21 and the pulse width control color temperature regulation module 22, and is used for receiving and regulating the gray scale and the current of the LED lamp string according to the current regulation signal and the color temperature regulation signal.

When implementing, the utility model discloses LED drive control circuit includes data input port DIN, data output port DOUT, the CS pin, the DIM port, the DRAIN port, power input port VIN, internal voltage port VDD and ground connection port GND, the CS pin is connected with voltage reference module 23, the DIM port is connected with pulse width control color modulation temperature module 22, the DIN port is connected with data sampling module 12, the DRAIN port is connected with DC-DC module 31, wherein, data input port DIN will provide different signals and give pulse width control color modulation temperature module and current regulation module, carry out grey scale and current regulation, drive LED lamp cluster through the DRAIN port at last. In some embodiments, the input signal of the data input port DIN may include various digital signals, such as a return-to-zero code signal, a 512 protocol, and a two-wire protocol, for feeding back the gray scale and current signals to be controlled to the chip internal pwm color temperature adjustment module 22 and the current adjustment module 21.

In practice, the light string control module 3 further includes:

and the over-temperature protection module 32 is connected with the DC-DC module 31, and is used for controlling the output current of the DC-DC module 31 according to the chip temperature. The over-temperature protection module 32 has an over-temperature current reduction protection function, and can generate heat to cause the temperature of the chip to rise when the control chip works, and when the temperature of the chip exceeds the preset protection temperature, the over-temperature protection module 32 is started to transmit a signal to the DC-DC module 31, so that the DC-DC module 31 reduces the size of output current, the chip works in a preset temperature range, and the chip is prevented from being damaged.

In some optional embodiments, the cascade module 4 includes:

the data cascading regeneration module 41 is connected with the data sampling module 12, and is configured to receive an external signal collected by the data sampling module 12, and then perform self-shaping on a cascading data signal of an external cascading chip to generate cascading data;

and the DOUT driving module 42, where the DOUT driving module 42 is connected to the data cascade regeneration module 41, and is configured to output the cascade data to the external cascade chip, and receive a data readback signal output by the external cascade chip, where in s, the data readback signal is used to read a preset LED light string control parameter.

In practice, the sampling type of the data sampling module 12 may include digital signals such as a return-to-zero code protocol or a 512 protocol, which are responsible for acquiring signals with different gray scales, current magnitudes and requirements provided by the outside. The data sampling module 12 performs data sampling by receiving an oscillation signal generated by an Oscillator (OSC)11, and transmits the sampled data signal to the data cascade regeneration module 41 for self-shaping; meanwhile, the sampling data is fed back to the pulse width control color temperature modulation module 22 and the current modulation module 21 to adjust the gray scale and the current gain of the LED lamp string. After receiving the data provided by the data sampling module 12, the data cascade regeneration module 41 automatically shapes the data output by the cascade and transmits the shaped data to the DOUT driver module 42. The data regeneration aims to prevent the signal transmission process from being attenuated and enhance the anti-interference capability. The DOUT driving module 42 is connected to the data output port DOUT, and the DOUT driving module 42 has a full-duplex communication function, and can output cascade data and receive externally provided data read-back signals. The data read-back signal can be used for reading current gain, gray scale and other LED lamp string control parameters in the chip. The data output port DOUT can transmit digital signals of 512 protocols, two-wire protocols, return-to-zero code protocols and the like to the back-end cascade chip for control, and is used for automatically shaping and forwarding data output by the cascade after receiving the data of the chip, so that the attenuation is avoided in the serial transmission process of the data.

In implementation, the cascade module 4 can realize a chip cascade pull function, as shown in fig. 4, and fig. 4 shows a cascade schematic diagram of the first chip U1 and the second chip U2. Wherein, the first chip U1 and the second chip U2 both include DIM pin (DIM port), VDD pin (internal voltage port VDD), DIN pin (data input port DIN), GND pin (ground port GND) VIN pin (power input port VIN), DRAIN pin (DRAIN port), DOUT pin (data output port DOUT) and CS pin, in the circuit of the first chip U1, the voltage of the external power supply is connected to the DRAIN pin of the first chip U1 through a first diode D1, LED lamp string and a first inductor L1 in turn, the positive terminal of the first diode D1 is grounded through a first capacitor E1, the positive terminal of the first diode D1 is also connected to the VIN pin of the first chip U1 through a first resistor R1, a second capacitor E2 and a second diode D2 are connected in parallel with the LED lamp string, and the second capacitor E2 and the second diode D2 are connected to the two ends of the first inductor L1 respectively, the CS pin of the first chip U1 is grounded through a first resistor R2, the GND pin of the first chip U1 is grounded, the DIN pin of the first chip U1 is connected to the signal input terminal DATA _ IN through a third resistor R3, the DOUT pin of the first chip U1 is connected to the signal output terminal DATA _ OUT through a fourth resistor R4, the VDD pin of the first chip U1 is grounded through a third capacitor C1, and the DIM pin of the first chip U1 is connected to the PWM signal input terminal through a fifth resistor R5. IN the circuit of the second chip U2, the voltage of the external power supply is connected to the DRAIN pin of the second chip U2 through the first diode D1, the LED string and the second inductor L2 IN sequence, the positive terminal of the first diode D1 is grounded through the fourth capacitor E4, the positive terminal of the first diode D1 is further connected to the VIN pin of the second chip U2 through the sixth resistor R6, the fifth capacitor E5 and the fourth diode D4 are connected IN parallel with the LED string, the fifth capacitor E5 and the fourth diode D4 are respectively connected to two terminals of the second inductor L2, the CS pin of the second chip U2 is grounded through the seventh resistor R7, the GND pin of the second chip U2 is grounded, the DIN pin of the second chip U2 is connected to the signal input terminal DATA _ IN through the eighth resistor R8, the DOUT pin of the second chip U2 is connected to the signal output terminal DATA _ OUT through the ninth resistor R9, the VDD pin of the second chip U8428 is connected to the signal input terminal of the tenth PWM chip U10 through the first resistor R867, a pull handle is cascaded between a signal input end DATA _ IN of the second chip U2 and a signal output end DATA _ OUT of the first chip U1, and a chip cascade function is achieved. Certainly, in implementation, the circuit is not limited to the cascade connection between two chips, and a cascade connection pull function between multiple chips can also be realized, for example, the circuit may be designed to include a third chip and a fourth chip, where the first chip, the second chip, the third chip and the fourth chip sequentially perform the cascade connection pull, and for the first chip, the second chip is an external cascade chip, similarly, for the second chip, the first chip and the third chip are external cascade chips, and for the third chip, the second chip and the fourth chip are external cascade chips, and the cascade connection pull between the chips can be performed to transmit data information.

In some optional embodiments, the control circuit further comprises:

and the power supply module 13 is connected with an external power supply and used for outputting a stable voltage signal to each power utilization unit. In implementation, an external power supply supplies power to the power supply module 13 through the power input port VIN, and then the power supply module 13 outputs a stable voltage signal to each power consumption unit to drive each power consumption unit to normally work.

The utility model discloses LED drive action circuit's basic operating principle as follows:

taking the first chip U1 in FIG. 3 as an example, the output current value of the second resistor R2 through the CS pin is set to a fixed value, for example, the output current value is I_OUT2The output end of the switch power supply is connected with the LED lamp string, and the current of the LED lamp string during working is I_OUT2. As shown in FIG. 6, each chip collects 16bit (bit 0-bit 15, 4bit for each R/G/B/W) current gain bits, intercepts current gain bit data according to the number of its own channel, and adjusts the current of the output port. Taking the cascade chip as a single-channel DC-DC chip as an example, the chip intercepts bit 12-bit 15 of the current gain bit; if the cascade chip is a three-channel R/G/B chip, intercepting bit 0-bit 11 of a current gain bit by the chip; if the cascade chip is a four-channel R/G/B/W chip, the chip intercepts bits 0-15 of the current gain bit. The current gain data bit can be I_OUT2Divided into a number of output current stages, I_{OUT2_1}、I_{OUT2_2}、I_{OUT2_3}… … after selecting one of the current gears, such as I_{OUT2_2}The adjustment can be performed by a PWM signal input by a DIM port or a gray scale signal input by a DIN port. For example, if the percentage of the data signal obtained by decoding the PWM signal inputted by DIM or the data signal inputted by DIN is 50%, the corresponding output current I of the LED string a is obtained_OUT2＝I_{OUT2_2}*50％。

The utility model discloses LED drive control circuit has the chip and cascades the function to return to zero the sign indicating number agreement as an example, please refer to fig. 5, unipolar return to zero sign indicating number, each code element all must have the low level. Each symbol of the protocol starts at a high level, and the time width of the high level determines a '0' code or a '1' code. The data cascade regeneration module 41 performs self-shaping on input data to ensure that the high level of the output 0 code of the DOUT port is 300 ns; the 1 code is 900 ns. Each chip intercepts data according to the number of own channels, as shown in fig. 6, each group of data is 32bit, if the first chip is a single-channel DC-DC chip, the chip intercepts only the first 8bit, bit 0-bit 7; the remaining data bits are transmitted to the back-end chip. If the rear end chip is the DC-DC chip, intercepting bit 8-bit 15 by the chip; the remaining data bits are transmitted to the back-end chip. As shown in FIG. 7, if the back end is a three-channel R/G/B chip, the chip intercepts bits 8-31, and the rest data are transmitted to the back end chip.

In some embodiments, the LED driver control circuit of the present invention may also be used in conjunction with a transcoding chip. Taking the 512 protocol return-to-zero code chip as an example, the transcoding chip can convert the 512 protocol into a return-to-zero code protocol as an input signal of the LED driving control circuit.

In order to solve the above technical problem, an embodiment of the present invention further provides a lamp, including an LED lamp string and an LED driving control circuit as above. The signal generating module generates a first control signal for adjusting the gray scale and the current gain of the LED lamp string, the data processing module generates a lamp string control signal according to the first control signal and outputs the lamp string control signal to the lamp string control module, the lamp string control module sets the magnitude of an output current value according to the lamp string control signal, the cascade module receives the first control signal output by the signal generating module, the output cascade data signal is automatically shaped, then shaped cascade data is output, the output gray scale of the cascade chip is set, cascade connection between DC-DC chips is realized, or the DC-DC chip and a three/four-channel LED constant current driving chip are connected by a cascade handle, the current gain of the DC-DC chip can be adjusted, the purpose of controlling various color temperature changes and leading the display effect to be more fine and smooth is achieved, and parameters such as the current gain or the gray scale setting can be read back through the cascade module, convenient to use, the later maintenance is high-efficient convenient.

The above description is only a preferred embodiment of the invention and is intended to illustrate the technical principles applied. It will be understood by those skilled in the art that the scope of the present disclosure is not limited to the specific combinations of the above-described features, but also encompasses other embodiments in which any combination of the above-described features or their equivalents is encompassed without departing from the spirit of the present disclosure. For example, the above features and (but not limited to) technical features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.

Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Likewise, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the invention. Certain features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims (10)

1. An LED drive control circuit, comprising:

the signal generating module is used for generating a first control signal, wherein the first control signal is used for adjusting the gray scale and the current gain of the LED lamp string;

the data processing module is connected with the signal generating module and used for generating a lamp string control signal according to the first control signal;

the light string control module is connected with the data processing module and used for adjusting the gray scale and the current of the LED light string according to the light string control signal;

and the cascade module is connected with the signal generation module and used for outputting cascade data and receiving a data read-back signal output by an external chip after receiving the first control signal.

2. The LED driving control circuit according to claim 1, wherein the signal generating module comprises:

an oscillator for generating a continuous periodic square wave signal;

and the data sampling module is used for receiving the square wave signal to be used as the first control signal to be output to the data processing module after the square wave signal is used for collecting an external signal.

3. The LED driving control circuit according to claim 2, wherein the data processing module comprises: the current adjusting module is connected with the voltage reference module and the data sampling module and used for generating a current adjusting signal according to a first control signal output by the data sampling module, adjusting a reference voltage output by the voltage reference module and outputting the reference voltage to the lamp string control module;

and the pulse width control color temperature adjusting module is connected with the oscillator and the data sampling module and used for generating a color temperature adjusting signal according to the first control signal output by the data sampling module and outputting the color temperature adjusting signal to the lamp string control module group.

4. The LED driving control circuit according to claim 3, wherein the voltage reference module is connected to the CS port of the control chip for generating the reference voltage according to the CS port and a ground resistor connected to the CS port.

5. The LED driving control circuit of claim 3, wherein the pulse width control color temperature adjusting module is connected to a DIM port of the control chip for generating the color temperature adjusting signal according to a PWM signal inputted from the DIM port.

6. The LED driving control circuit according to claim 3, wherein the light string control module comprises:

and the DC-DC module is connected with the current regulation module and the pulse width control color temperature regulation module and is used for receiving and regulating the gray scale and the current of the LED lamp string according to the current regulation signal and the color temperature regulation signal.

7. The LED drive control circuit of claim 6, wherein the light string control module further comprises:

and the over-temperature protection module is connected with the DC-DC module and is used for controlling the output current of the DC-DC module according to the chip temperature.

8. The LED driving control circuit according to claim 2, wherein the cascade module comprises:

the data cascading regeneration module is connected with the data sampling module and used for receiving the external signal collected by the data sampling module and then self-shaping the cascading data signal of the external cascading chip to generate cascading data;

and the DOUT driving module is connected with the data cascade regeneration module and is used for outputting the cascade data to the external cascade chip and receiving a data readback signal output by the external cascade chip, wherein the data readback signal is used for reading preset LED lamp string control parameters.

9. The LED drive control circuit of claim 1, wherein the control circuit further comprises:

and the power supply module is connected with an external power supply and used for outputting stable voltage signals to each power utilization unit.

10. A light fixture, characterized by: the lamp comprises an LED lamp string and the LED drive control circuit as claimed in any one of claims 1 to 9.

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