CN111698814A - LED driving circuit with double-line input and output and transmission method thereof - Google Patents
LED driving circuit with double-line input and output and transmission method thereof Download PDFInfo
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Abstract
The invention discloses a double-line input and output LED drive circuit and a transmission method thereof, wherein the double-line input and output LED drive circuit comprises the following steps: the LED driving system comprises a plurality of cascaded LED driving modules, wherein the initial LED driving module is at least provided with one signal input end and two signal output ends, the rest LED driving modules are respectively provided with two signal input ends and two signal output ends, and the two signal input ends of the later-stage LED driving module are respectively connected with the two signal output ends of the last-stage LED driving module; after the driving signal is input from the circuit signal input end of the LED driving module at the starting end, the driving signal is transmitted to two signal input ends of the LED driving module at the next stage in a two-wire output mode, and the remaining LED driving modules sequentially transmit the driving signal to the following multi-stage LED driving modules in a two-wire input and output mode. The LED driving circuit adopts two independent input signals, when any input signal or output signal is damaged, the other input signal or output signal is automatically switched to work, and large-area abnormal work caused by signal damage at a certain point can be avoided. Meanwhile, the LED driving module adopts two-way signal output, each way of output signal is only transmitted to the next control chip, and large output driving power is not needed. In addition, the output signal adopts a time sequence staggered circuit. In theory, the electromagnetic radiation can be reduced by more than half without producing reflection interference.
Description
Technical Field
The invention relates to the technical field of LED driving circuits and driving signal transmission methods, in particular to a double-line input and output LED driving circuit and a transmission method thereof.
Background
In LED lighting, a cascade control mode is usually adopted, and LED driving signals control lighting or color change of LEDs through multi-stage transmission. At present, the conventional LED cascade control circuit mostly adopts a single-wire signal input mode, as shown in fig. 6. The driving signal is input from the input end DIN of the LED driving module 1, output from the output end DO, and sequentially transmitted backward. The biggest defects of the single-wire signal transmission mode are as follows: when the input and output of the signal are broken or damaged, the cascade control signal cannot be transmitted backwards, and any point is damaged, so that large-range abnormity is caused.
In view of this, the following improvements have been proposed. See patent application No.: 201110325917.5, the Chinese patent of the invention. The patent refers to the field of 'semiconductor devices and electric solid state devices'. As shown in fig. 7, the technical solution adopted by this patent document is: each LED driving module includes two signal input terminals DIN1, DIN2, and one of the input terminals DIN2 of the LED driving module of the next stage is connected with the input terminal DIN1 of the LED driving module of the previous stage. After the technical scheme is adopted, the LED driving module is provided with two paths of input signals at the same time, any one path of input signal is broken or damaged, and the other path of input signal can ensure that the signals can be continuously and effectively transmitted. However, this solution still has certain disadvantages: if the solution is applied to a pixel lamp application with a long transmission distance between the point and the point, as shown in fig. 7, one output port provides a signal source for two input signals. If the signal line length of DO to DIN1 for each LED driver module is 1 meter, the connection according to fig. 7 shows: the distance from the DO of the LED driving module 1 to the DIN1 of the LED driving module 2 is 1 meter, the distance from the DO of the LED driving module 3 to the DIN2 of the LED driving module is 2 meters, the lengths of wires for signal transmission are different by one time, signal impedance is different necessarily, matching is difficult, and generated reflection interference is large. Meanwhile, the DO signal of the LED driving module 1 is sent to both the LED driving module 2 and the LED driving module 3, the signal output needs strong driving capability, the generated electromagnetic radiation is large, and the signal does not accord with the industrial standard.
In view of the above problems, the present inventors provide an LED multilevel driving circuit capable of improving the stability and reliability of LED driving data transmission.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a double-line input and output LED driving circuit and a transmission method thereof.
In order to solve the technical problem, the LED driving circuit with double input and output lines adopts the following technical scheme: a two-wire input-output LED driving circuit, comprising: the initial LED driving module is provided with at least one signal input end and two signal output ends, the rest LED driving modules are provided with two signal input ends and two signal output ends, and the two signal input ends of the later-stage LED driving module are respectively connected with the two signal output ends of the last-stage LED driving module; after the driving signal is input from the signal input end of the LED driving module at the starting end, the driving signal is transmitted to the two signal input ends of the LED driving module at the next stage in a two-line output mode, and the remaining LED driving modules sequentially transmit the driving signal to the following multi-stage LED driving modules in a two-line input and output mode.
Further, in the above technical solution, each LED driving module includes a data decoding circuit, an LED internal logic control circuit, an RGB three-channel driving circuit, and a data shaping and amplifying circuit.
Further, in the above technical solution, the data decoding circuit includes: the noise suppression circuit comprises a preceding stage processing circuit of two paths of input signals and is used for suppressing interference noise of the input signals; the data identification circuit is used for distinguishing the data of the 0 code and the 1 code, screening effective data and removing pseudo data; the data switching selection circuit stores correct data into a register and outputs and displays the data by identifying and comparing the data of the two signal input ends; and the data synchronization processing circuit is used for verifying and processing the effective data and staggering the switching time of the two paths of signals to generate two paths of synchronization signals.
Further, in the above technical solution, the signal transmission distances from the signal output end between two adjacent LED driving modules to the two signal input ends are equal.
The transmission method of the LED drive circuit with two input and output lines adopts the following technical scheme: firstly, a start end LED driving module receives a driving signal of a controller at least through a signal input end; secondly, the starting end LED driving module transmits driving signals to two signal input ends of a next-stage LED driving module by two signal output ends in a two-line output mode; and then, sequentially transmitting the driving signals to the following multistage LED driving modules from the LED driving module at the starting end in a double-wire input and output mode.
Further, in the above technical solution, in the transmission process of the LED driving signal, when any LED driving module except the LED driving module at the start end receives the driving signal and the input signal or the output signal is damaged, the other path is automatically switched to work.
Further, in the above technical solution, the two output signals output by each LED driving module are subjected to time sequence staggering processing, so that peaks and troughs of the two output signals are staggered.
Further, in the above technical solution, each LED driving module performs sound suppression processing, two-path signal timing staggering processing, signal comparison and correction processing, and two-path signal automatic switching processing on an input signal, and finally outputs the input signal to the next-stage LED driving module after shaping and amplifying processing.
Further, in the above technical solution, the initial LED driving module has at least one signal input terminal and two signal output terminals, each of the remaining LED driving modules has two signal input terminals and two signal output terminals, and the two signal input terminals of the next-stage LED driving module are respectively connected to the two signal output terminals of the previous-stage LED driving module; each driving module comprises a data decoding circuit, an LED internal logic control circuit, an RGB three-channel driving circuit and a data shaping amplifying circuit; after the driving signal is input from the circuit signal input end of the LED driving module at the starting end, the driving signal is processed by a data decoding circuit, an LED internal logic control circuit and an RGB three-channel driving circuit in the LED driving module, then the driving signal is shaped, amplified and output to two signal output ends, the driving signal is transmitted to two signal input ends of the LED driving module at the next stage in a two-wire output mode, and the remaining LED driving modules all adopt two-wire input and output to sequentially transmit the driving signal backwards to the rear multistage LED driving modules.
Further, in the above technical solution, the LED internal logic control circuit receives correct 0-code and 1-code data in the data decoding circuit to form PWM control signals with different duty ratios; the RGB three-channel driving circuit comprises a PWM receiving circuit and an LED constant current driving circuit.
After the technical scheme is adopted, the LED driving circuit adopts two independent input signals, when any input signal or output signal is damaged, the other input signal or output signal is automatically switched to work, and large-area work abnormality caused by signal damage at a certain point can be avoided. Meanwhile, the LED driving module adopts two-way signal output, each way of output signal is only transmitted to the next control chip, and large output driving power is not needed. In addition, the output signal adopts a time sequence staggered circuit. In theory, the electromagnetic radiation can be reduced by more than half without producing reflection interference.
Meanwhile, after signals are transmitted in a long distance and are interfered by external strong electromagnetic radiation, waveforms can generate distortion to a certain degree, the signal quality and the product stability are influenced, and in order to improve the stability, the interference problem can be well improved through a double-path signal comparison circuit and an automatic error correction circuit which are arranged in the LED module.
Drawings
FIG. 1 is a schematic circuit diagram of a two-wire input-output LED driving circuit according to the present invention;
FIG. 2 is a block diagram of an internal circuit of the LED driving module according to the present invention;
FIG. 3 is a schematic diagram of a data decoding circuit of the LED driver module of the present invention;
FIG. 4 is a schematic diagram of a pin of an LED driver module according to the present invention;
FIG. 5 is a schematic diagram of an internal timing staggering circuit for driving signal transmission according to the present invention;
FIG. 6 is a block diagram of a conventional single-line-in single-line-out circuit;
fig. 7 is a circuit block diagram of a prior art two-way input terminal technology.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the circuit schematic diagram of the LED driving circuit with two input and output lines according to the present invention includes a plurality of cascaded LED driving modules, each LED driving module has two signal input terminals DIN1 and DIN2 and two signal output terminals DO1 and DO2, and the two signal input terminals DIN1 and DIN2 of the LED driving module at the next stage are respectively connected to the two signal output terminals DO1 and DO2 of the LED driving module at the previous stage. After the driving signal is input from the circuit signal input end of the LED driving module at the starting end, the driving signal is transmitted to two signal input ends of the LED driving module at the next stage in a two-wire output mode, and the remaining LED driving modules sequentially transmit the driving signal to the following multi-stage LED driving modules in a two-wire input and output mode.
Of course, the initial LED driver module may also use one signal input. That is, the initial LED driving module has at least one signal input terminal DIN1 or DIN2 for receiving the driving signal of the controller.
The driving signal transmission method of the present invention is as follows. When the starting end LED driving module works, firstly, the starting end LED driving module receives a driving signal of a controller at least through a signal input end;
secondly, the starting end LED driving module transmits driving signals to two signal input ends of a next-stage LED driving module by two signal output ends in a two-line output mode;
and then, sequentially transmitting the driving signals to the following multistage LED driving modules from the LED driving module at the starting end in a double-wire input and output mode.
That is, the signal input terminals DIN1 and DIN2 of the LED driving module 1 are used for receiving LED driving data output by the controller, and the two-way signal input terminals DIN1 and DIN2 of the LED driving module 2 are used for receiving two-way signal output terminals DO1 and DO2 of the LED driving module 1, respectively, after the LED driving module 1. The two signal input terminals DIN1 and DIN2 of the LED driving module 3 are respectively used for receiving two signal output terminals DO1 and DO2 of the LED driving module 2. And so on in the following.
In a wiring mode among the LED driving modules, each LED module is provided with two independent signal receiving ends. When any input signal or output signal is damaged, the other path is automatically switched to work, and large-area abnormal work caused by signal damage at a certain point can be avoided.
Referring to fig. 2, it is a block diagram of the internal structure of the LED driving module of the present invention, and each driving module includes a data decoding circuit, an LED internal logic control circuit, an RGB three-channel driving circuit, and a data shaping and amplifying circuit. When the LED driving module operates, the driving signals are received by the signal receiving terminals DIN1 and DIN 2. The data code of the driving signal is generally composed of 3 sets of data of 8 bits or 16 bits.
After the driving signal is input from the circuit signal input end of the LED driving module at the starting end, the driving signal is processed by a data decoding circuit, an LED internal logic control circuit and an RGB three-channel driving circuit in the LED driving module, then the driving signal is shaped, amplified and output to two signal output ends, the driving signal is transmitted to two signal input ends of the LED driving module at the next stage in a two-wire output mode, and the remaining LED driving modules all adopt two-wire input and output to sequentially transmit the driving signal backwards to the rear multistage LED driving modules.
The LED internal logic control circuit receives correct 0 code data and 1 code data in the data decoding circuit to form PWM control signals with different duty ratios; the RGB three-channel driving circuit comprises a PWM receiving circuit and an LED constant current driving circuit.
The data decoding circuit comprises a noise suppression circuit, a data decoding circuit and a data processing circuit, wherein the noise suppression circuit comprises a preceding-stage processing circuit of two paths of input signals and is used for suppressing the interference noise of the input signals;
the data identification circuit is used for distinguishing the data of the 0 code and the 1 code, screening effective data and removing pseudo data;
the data switching selection circuit is used for storing correct data into a register and outputting and displaying the correct data by identifying and comparing data of two signal input ends DIN1 and DIN 2;
and the data synchronization processing circuit is used for verifying and processing the effective data and staggering the switching time of the two paths of signals to generate two paths of synchronization signals. The data is synchronized by the internal frequency of the LED driving module chip, so that errors caused by external or cascade delay in the cascade process can be avoided. The edges of the two paths of signal switches are staggered, so that the superposition of switching noise can be better avoided, and the EMI (electro-magnetic interference) is reduced.
In operation, after the signal receiving terminals DIN1 and DIN2 of the LED driving module receive the driving signal, noise suppression is performed first. As shown in connection with fig. 3. The specific mode is as follows: the internal clock of the LED driving module firstly samples the high level width of the signal input end, if the low level signal is found within 0.2us of sampling time, the sampling is finished, and the input driving signal is judged to be noise. The signal outputs DO1 and DO2 of the corresponding LED driving modules DO not output signals. Similarly, the data register also considers that no valid data has been received. Until the input signal at the subsequent signal input terminal DIN1 or DIN2 has a high level width greater than two clock periods.
The data identification circuit works according to the following principle:
and (3) code identification judgment: when the LED driving module detects that the high level width of the signals DIN1 and DIN2 is greater than 0.2us, the internal clock continues to sample the high level width of the signal port, when the sampling time finds that the low level signal is within 0.45us, the sampling is finished, and the signal is judged to be a 0-code high level signal (namely T0H), and when the LED driving module identifies valid T0H data, the time of the low level time lasting until the next high level signal is judged to be a 0-code low level signal (namely T0L). The synchronization signals corresponding to the outputs of DO1 and DO2 produce a standard 0 code with a high level width of 0.36us, and the data register is also considered to receive valid data.
1, code identification and judgment: when the LED driving module detects that the high level width of the signals DIN1 and DIN2 is greater than 0.55us, the internal clock continues to sample the high level width of the signal port, when the low level signal is found within 1us of the sampling time, the sampling is finished, and the signal is judged to be a 1-code high level signal (namely T1H), and when the LED driving module identifies valid T1H data, the time when the low level time lasts until the next high level signal is judged to be a 1-code low level signal (namely T1L). The synchronization signals corresponding to the outputs of DO1 and DO2 produce a standard 1 code with a high level width of 0.72us, and the data register is also considered to receive valid data.
Judging the pseudo data: if the LED driving module detects that the high level widths of the signals DIN1 and DIN2 are greater than 0.45us and less than 0.55us, and the time is between the time ranges of T0H and T1H, the pattern is abnormal in the signal transmission process, and finally the signal is misjudged. When the abnormal phenomenon occurs, the LED driving module is determined to receive the false data. If the phenomenon occurs in the DIN1 data, the LED driving module will determine that the signal at DIN1 is abnormal, the data register will import the normal DIN2 data, the DO1 will interrupt the output, and the DO2 will output normally. And vice versa. If the data in DIN1 and DIN2 are both false data, the data register will not store the data in the frame and will not refresh, DO1 and DO2 will interrupt the output; if the LED driving module detects that the high level width of the signals DIN1 and DIN2 is greater than 1us, and the time exceeds the maximum range of T1H, the system transmission and counting will be unstable, and the LED driving module cannot recognize the valid 1-code data. When the abnormal phenomenon occurs, the LED driving module is determined to receive the false data. If the phenomenon occurs in the DIN1 data, the LED driving module will determine that the signal at DIN1 is abnormal, the data register will import the normal DIN2 data, the DO1 will interrupt the output, and the DO2 will output normally. And vice versa. If the data in DIN1 and DIN2 are both false data, the data register will not store the data in the frame, and will not be refreshed, and DO1 and DO2 will interrupt the output.
When the data register in the data decoding circuit stores the effective 0 code and 1 code data, the data are transmitted to the LED internal logic circuit for output, PWM data with different duty ratios are generated according to the identified data, and the RGB three-channel driving circuit receives the corresponding PWM data and then drives the external LED with constant current. For example, fig. 5 is a timing chart of two signal output paths of the LED driving module, in order to reduce the total amount of signal radiation at the same time, synchronization signals generated after decoding by the chip are staggered from each other, so as to reduce the electromagnetic radiation of the LED driving module to the maximum. The data shaping amplifying output circuit amplifies and shapes the synchronous signal and outputs the synchronous signal to DO1 and DO 2.
Therefore, the two output signals output by the LED driving module are subjected to time sequence staggered processing, and wave crests and wave troughs of the two output signals are staggered, so that the electromagnetic radiation is further reduced. As shown in fig. 5, a timing staggering circuit is added in the chip for two output signals DO1 and DO2, and the rising time point and the falling time point of DO1 and DO2 are staggered with each other, that is, the wave peak and the wave trough of DO1 signal emission and the wave peak and the wave trough of DO2 signal emission are staggered, so that the wave peak and the wave trough are not superposed at the same time, electromagnetic radiation can be effectively reduced, theoretically, electromagnetic radiation can be reduced by more than half, and meanwhile, reflection interference can not be generated.
After the multistage LED driving module adopts the connection mode, each LED module is provided with two independent signal receiving ends. When any input signal or output signal is damaged, the other path is automatically switched to work, and large-area abnormal work caused by signal damage at a certain point can be avoided. Meanwhile, two paths of signals are output, each path of output signal is only transmitted to the next control chip, and large output driving power is not needed. If the distance between the signal lines between the signal LED driving modules is 1 meter, the distance between each signal input and each signal output is 1 meter, good impedance matching is achieved between signal sending and signal receiving, driving power can be kept consistent, and signal transmission is more stable. Meanwhile, after signals are transmitted in a long distance and are interfered by external strong electromagnetic radiation, waveforms can generate distortion to a certain degree, the signal quality and the product stability are influenced, and in order to improve the stability, the interference problem can be well improved through a double-path signal comparison circuit and an automatic error correction circuit which are arranged in the LED module.
It is understood that the above description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and all equivalent changes or modifications in the structure, characteristics and principles of the present invention as described in the claims should be included in the claims.
Claims (10)
1. A two-wire input-output LED driving circuit, comprising: a plurality of cascaded LED drive modules, its characterized in that:
the initial LED driving module is provided with at least one signal input end and two signal output ends, the rest LED driving modules are provided with two signal input ends and two signal output ends, and the two signal input ends of the later-stage LED driving module are respectively connected with the two signal output ends of the last-stage LED driving module;
after the driving signal is input from the signal input end of the LED driving module at the starting end, the driving signal is transmitted to the two signal input ends of the LED driving module at the next stage in a two-line output mode, and the remaining LED driving modules sequentially transmit the driving signal to the following multi-stage LED driving modules in a two-line input and output mode.
2. The two-wire input-output LED driving circuit according to claim 1, wherein: each LED driving module comprises a data decoding circuit, an LED internal logic control circuit, an RGB three-channel driving circuit and a data shaping amplifying circuit.
3. The two-wire input and output LED driving circuit according to claim 2, wherein: the data decoding circuit comprises:
the noise suppression circuit comprises a preceding-stage processing circuit of two paths of input signals and is used for suppressing interference noise of the input signals;
the data identification circuit is used for distinguishing the data of the 0 code and the 1 code, screening effective data and removing pseudo data;
the data switching selection circuit stores correct data into a register and outputs and displays the data by identifying and comparing the data of the two signal input ends;
and the data synchronization processing circuit is used for verifying and processing the effective data and staggering the switching time of the two paths of signals to generate two paths of synchronization signals.
4. The two-wire input-output LED driving circuit according to claim 1, wherein: and the signal transmission distance from the signal output end between two adjacent LED driving modules to the two paths of signal input ends is equal.
5. A transmission method of a double-line input and output LED drive circuit is used for LED drive signal transmission in a multi-cascade LED drive module, and is characterized in that: the transmission method comprises the following steps of,
firstly, a starting end LED driving module receives a driving signal of a controller at least through a signal input end;
secondly, the starting end LED driving module transmits driving signals to two signal input ends of a next-stage LED driving module by two signal output ends in a two-line output mode;
and then, sequentially transmitting the driving signals to the following multistage LED driving modules from the LED driving module at the starting end in a double-wire input and output mode.
6. The transmission method of the two-wire input and output LED drive circuit according to claim 5, wherein: in the transmission process of the LED driving signal, except that any LED driving module at the starting end receives the driving signal, when the input signal or the output signal is damaged, the other path is automatically switched to work.
7. The transmission method of the two-wire input and output LED drive circuit according to claim 5, wherein: and the two output signals output by each LED driving module are subjected to time sequence staggered processing, so that wave crests and wave troughs of the two output signals are staggered.
8. The transmission method of the two-wire input and output LED drive circuit according to claim 5, wherein: each LED driving module performs sound suppression processing, two-path signal time sequence staggering processing, signal comparison correction processing and two-path signal automatic switching processing on input signals, and finally outputs the input signals to the next-stage LED driving module after shaping and amplifying processing.
9. The transmission method of the two-wire input and output LED driving circuit according to any one of claims 5 to 8, wherein:
the initial LED driving module is provided with at least one signal input end and two signal output ends, the rest LED driving modules are provided with two signal input ends and two signal output ends, and the two signal input ends of the later-stage LED driving module are respectively connected with the two signal output ends of the last-stage LED driving module; each driving module comprises a data decoding circuit, an LED internal logic control circuit, an RGB three-channel driving circuit and a data shaping amplifying circuit;
after the driving signal is input from the circuit signal input end of the LED driving module at the starting end, the driving signal is processed by a data decoding circuit, an LED internal logic control circuit and an RGB three-channel driving circuit in the LED driving module, then the driving signal is shaped, amplified and output to two signal output ends, the driving signal is transmitted to two signal input ends of the LED driving module at the next stage in a two-wire output mode, and the remaining LED driving modules all adopt two-wire input and output to sequentially transmit the driving signal backwards to the rear multistage LED driving modules.
10. The transmission method of the two-wire input and output LED driving circuit according to claim 9, wherein: the LED internal logic control circuit receives correct 0 code data and 1 code data in the data decoding circuit to form PWM control signals with different duty ratios; the RGB three-channel driving circuit comprises a PWM receiving circuit and an LED constant current driving circuit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113628581A (en) * | 2021-10-11 | 2021-11-09 | 杭州视芯科技有限公司 | LED driving circuit, driving method and LED display system |
| CN114241984A (en) * | 2022-02-08 | 2022-03-25 | 深圳市绿源半导体技术有限公司 | LED driving device, multistage LED driving system and driving method |
| WO2023088057A1 (en) * | 2021-11-17 | 2023-05-25 | 深圳市明微电子股份有限公司 | Led driving data transmission method and led driving circuit |
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| CN113628581A (en) * | 2021-10-11 | 2021-11-09 | 杭州视芯科技有限公司 | LED driving circuit, driving method and LED display system |
| CN113628581B (en) * | 2021-10-11 | 2022-03-15 | 杭州视芯科技股份有限公司 | LED driving circuit, driving method and LED display system |
| WO2023060845A1 (en) * | 2021-10-11 | 2023-04-20 | 杭州视芯科技股份有限公司 | Led driving circuit, driving method, and led display system |
| WO2023088057A1 (en) * | 2021-11-17 | 2023-05-25 | 深圳市明微电子股份有限公司 | Led driving data transmission method and led driving circuit |
| CN114241984A (en) * | 2022-02-08 | 2022-03-25 | 深圳市绿源半导体技术有限公司 | LED driving device, multistage LED driving system and driving method |
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