CN114390751B

CN114390751B - LED drive circuit and LED assembly

Info

Publication number: CN114390751B
Application number: CN202111611375.8A
Authority: CN
Inventors: 彭峰杰; 张涛; 杨小虎
Original assignee: Shenzhen Gongjin Electronics Co Ltd
Current assignee: Shenzhen Gongjin Electronics Co Ltd
Priority date: 2021-12-27
Filing date: 2021-12-27
Publication date: 2024-05-10
Anticipated expiration: 2041-12-27
Also published as: CN114390751A

Abstract

The invention provides an LED driving circuit and an LED assembly, wherein the LED driving circuit comprises: the control circuit is used for outputting at least one path of first level driving signals, and the first level driving signals are high level or low level; and the driving circuit is connected with the control circuit, and the driving circuit is triggered by the level combination state of at least one path of first level driving signals to output m paths of second level driving signals to the corresponding n paths of LED lamps so as to drive the n paths of LED lamps to correspondingly light up or light down, wherein the second level driving signals are high level or low level, and m is more than or equal to n. The invention can drive more LED lamps by using fewer control circuits, thereby simplifying the structure of the circuit, improving the utilization rate of the control circuit, saving the space occupied by the whole circuit, and simultaneously reducing the production process and the manufacturing cost.

Description

LED drive circuit and LED assembly

Technical Field

The invention belongs to the technical field of LED circuits, and particularly relates to an LED driving circuit and an LED assembly.

Background

Currently, light emitting diodes, i.e. LEDs, are increasingly used. It has unidirectional electrical conductivity, i.e. when forward voltage is applied to the anode and cathode of the LED, the LED lamp lights up, and when reverse voltage is applied to the anode and cathode, the LED lamp extinguishes.

In the conventional LED circuit, the LED lamps are generally driven by the controller, however, since the number of LED lamps in the LED circuit is generally large, in order to ensure the driving effect, a controller is generally configured for each LED lamp, but in this way, the structure of the whole circuit becomes complex, the utilization rate of the controller is also low, the space occupied by the whole circuit is large, and the production process and the manufacturing cost are also correspondingly improved. When the number of the controllers and the terminals thereof is insufficient and the number of the LED lamps is large, the driving effect cannot be ensured.

Therefore, in the traditional technical scheme, the circuit structure is complex, the utilization rate of the controller is low, the occupied space of the whole circuit is large, the production process and the manufacturing cost are correspondingly improved, and when the number of the controller and the terminals thereof is insufficient and the number of the LED lamps is large, the problem of realizing the driving effect cannot be guaranteed.

Disclosure of Invention

The invention aims to provide an LED driving circuit and an LED assembly, and aims to solve the problems of high driving cost and poor driving effect of the traditional LED circuit.

A first aspect of an embodiment of the present invention provides an LED driving circuit, including:

The control circuit is used for outputting at least one path of first level driving signals, and the first level driving signals are high level or low level;

And the driving circuit is connected with the control circuit, and is triggered by the level combination state of at least one path of first level driving signals to output m paths of second level driving signals to the corresponding n paths of LED lamps so as to drive the n paths of LED lamps to correspondingly light up or turn off, wherein the second level driving signals are high level or low level, and m is more than or equal to n.

In one embodiment, the m paths of second level driving signals comprise x paths of third level driving signals respectively and correspondingly output to one ends of the x paths of LED lamps, and n paths of fourth level driving signals at the other ends of the n paths of LED lamps, wherein the third level driving signals are high level or low level, and the fourth level driving signals are high level or low level, and x is less than or equal to n.

In one embodiment, the driving circuit includes:

the gating output circuit is connected with the control circuit and used for gating and outputting x paths of third level driving signals to one end of the corresponding x paths of LED lamps under the level combination state of a plurality of paths of first level driving signals in at least one path of first level driving signals;

And the logic output circuit is connected with the control circuit, and outputs n paths of fourth level driving signals to the other ends of the corresponding n paths of LED lamps by level combination logic conversion of a plurality of paths of first level driving signals in at least one path of first level driving signals.

In one embodiment, the gate output circuit comprises a first level shifter and a multi-channel gate driver, wherein the multi-channel gate driver comprises a multi-channel signal input end, a multi-channel enabling signal end and a multi-channel signal output end, and the signal input end, the enabling signal end and the signal output end are in one-to-one correspondence;

A plurality of enable signal ends in the plurality of enable signal ends are connected with the control circuit through the first level converter, and the rest enable signal ends are connected with the control circuit;

The signal input ends are used for receiving a plurality of first level driving signals in at least one path of first level driving signals, and the signal output ends are used for outputting x paths of third level driving signals to one end of the corresponding x paths of LED lamps;

The first level shifter is used for turning over the first level driving signal;

The multi-channel gating driver is triggered to conduct the corresponding signal output end by the level combination state of the first level driving signal received by the enabling signal end and the level driving signal output by the first level converter.

In one embodiment, the first level shifter includes at least one first NOT gate.

In one embodiment, the logic output circuit includes a first logic circuit, a second logic circuit, and a second level shifter;

The input end of the first logic circuit is connected with the control circuit, the output end of the first logic circuit is connected with the input end of the second level converter, and the output end of the second level converter is connected with the other end of the LED lamp;

The input end of the second logic circuit is connected with the control circuit, and the output end of the second logic circuit is connected with the other end of the LED lamp;

The first logic circuit is configured to receive a plurality of the first level driving signals in at least one path of the first level driving signals, and convert and output a fifth level driving signal to the second level converter, where the fifth level driving signal is a high level or a low level;

The second level converter is used for turning over the fifth level driving signal and outputting k paths of fourth level driving signals to the other ends of the corresponding k paths of LED lamps, wherein k is smaller than n;

the second logic circuit is used for receiving a plurality of paths of first level driving signals in at least one path of first level driving signals, and converting and outputting n-k paths of fourth level driving signals to the other end of the corresponding n-k paths of LED lamps.

In one embodiment, the first logic circuit includes at least one exclusive or gate correspondingly connected to the control circuit.

In one embodiment, the second logic circuit includes at least one or gate correspondingly connected to the control circuit.

In one embodiment, the second level shifter includes at least one second NOT gate correspondingly coupled to the first logic circuit.

A second aspect of an embodiment of the present invention provides an LED assembly, including a plurality of LED lamps and an LED driving circuit as described above, where the LED driving circuit is correspondingly connected to the plurality of LED lamps.

Compared with the prior art, the embodiment of the invention has the beneficial effects that: according to the LED driving circuit, the control circuit outputting at least one path of first level driving signals is connected with the driving circuit, the driving circuit outputs m paths of second level driving signals to the corresponding n paths of LED lamps, and therefore the driving of more LED lamps by using fewer control circuits can be achieved, the circuit structure is simplified, the utilization rate of the control circuit is improved, the space occupied by the whole circuit is saved, meanwhile, the production process and the manufacturing cost are reduced, and when the number of the control circuits and the terminals of the control circuits is insufficient, and the number of the LED lamps is more, the driving effect can still be achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a first structure of an LED driving circuit according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of a second structure of an LED driving circuit according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of a third structure of an LED driving circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a fourth structure of an LED driving circuit according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of a fifth structure of an LED driving circuit according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a sixth structure of an LED driving circuit according to an embodiment of the present invention;

fig. 7 is a schematic block diagram of an LED assembly according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Example 1

Referring to fig. 1, the present embodiment provides an LED driving circuit, which includes:

A control circuit 11 for outputting at least one first level driving signal, where the first level driving signal is a high level or a low level;

the driving circuit 12 is connected with the control circuit 11, the driving circuit 12 is triggered by the level combination state of at least one path of the first level driving signals to output m paths of second level driving signals to the corresponding n paths of LED lamps 13, so as to drive the n paths of LED lamps 13 to be correspondingly turned on or off, and the second level driving signals are high level or low level, wherein m is greater than or equal to n.

In this embodiment, it should be noted that, the control circuit 11 may be a microcontroller, a single chip microcomputer, or the like, and has at least one output end for outputting at least one path of first level driving signals, the driving circuit 12 may have a gating and logic conversion function, the gating module and the logic conversion module may be integrated or separated, and the number of output ends is greater than the number of input ends, so that fewer first level driving signals pass through the driving circuit 12 and then output more second level driving signals, m and n may be any positive integer, as shown in fig. 2, optionally, the control circuit 11 has four output ends, respectively, GPIO1, GPIO2, GPIO3, and GPIO4, so that the control circuit 11 can output at least one path of first level driving signals, and the driving circuit 12 can turn off at most eight paths of second level driving signals to the corresponding four paths of LED lamps 13 to correspondingly turn on or off the four paths of LED lamps 13.

Through connecting the control circuit 11 outputting at least one path of first level driving signals with the driving circuit 12, the driving circuit 12 outputs m paths of second level driving signals to the corresponding n paths of LED lamps 13, and the driving of more LED lamps 13 by using fewer control circuits 11 can be realized, so that the circuit structure is simplified, the utilization rate of the control circuit 11 is improved, the space occupied by the whole circuit is saved, meanwhile, the production process and the manufacturing cost are reduced, and when the number of the control circuits 11 and the terminals thereof is insufficient and the number of the LED lamps 13 is more, the driving effect can still be realized.

Optionally, the m paths of second level driving signals include x paths of third level driving signals respectively corresponding to and output to one end of the x paths of LED lamps 13, and n paths of fourth level driving signals at the other end of the n paths of LED lamps 13, where the third level driving signals are high level or low level, and the fourth level driving signals are high level or low level, and x is less than or equal to n.

In this embodiment, it should be noted that, the gating module of the driving circuit 12 outputs the third level driving signal, and the gating module may gate all the LED lamps 13, or gate part of the LED lamps 13, so x is any positive integer less than or equal to n, and the logic conversion module outputs the fourth level driving signal to all the LED lamps 13, as shown in fig. 2, alternatively, the driving circuit 12 may output at most eight paths of the second level driving signals to two ends of the LED lamps 13, including less than or equal to four paths of the third level driving signals and four paths of the fourth level driving signals.

Through respectively correspondingly outputting m paths of second level driving signals to one end of the x paths of LED lamps 13 and the other end of the n paths of LED lamps 13, the LED driving circuit can drive the LED lamps 13 from two ends of the LED lamps 13, so that the diversity of driving methods is improved.

Optionally, the driving circuit 12 includes:

The gating output circuit 121 is connected to the control circuit 11, and the gating output circuit 121 receives a level combination state of a plurality of the first level driving signals in at least one path of the first level driving signals and gates and outputs x paths of the third level driving signals to one end of the corresponding x paths of the LED lamps 13;

the logic output circuit 122 is connected to the control circuit 11, and the logic output circuit 122 receives a level combination logic conversion of at least one of the first level driving signals to output n fourth level driving signals to the other ends of the corresponding n LED lamps 13.

In this embodiment, it should be noted that, the gate output circuit 121 and the logic output circuit 122 may receive different ones of the at least one first level driving signal and may also receive the same ones of the at least one first level driving signal, as shown in fig. 3, optionally, the gate output circuit 121 gates and outputs at most four third level driving signals to one end of the corresponding four LED lamps 13 by a level combination state of the first level driving signals output by the GPIO3 and the GPIO4, and the logic output circuit 122 outputs four fourth level driving signals to the other end of the corresponding four LED lamps 13 by a level combination logic conversion of the first level driving signals output by the GPIO1 and the GPIO 2.

By connecting the gate output circuit 121 and the logic output circuit 122 to both ends of the LED lamp 13, respectively, the LED driving circuit can drive the LED lamp 13 from both ends of the LED lamp 13.

Optionally, the gate output circuit 121 includes a first level shifter 1211 and a multi-channel gate driver 1212, where the multi-channel gate driver 1212 includes a multi-channel signal input terminal, a multi-channel enable signal terminal, and a multi-channel signal output terminal, and the signal input terminal, the enable signal terminal, and the signal output terminal are in one-to-one correspondence;

A plurality of the enable signal terminals of the plurality of enable signal terminals are connected with the control circuit 11 through the first level converter 1211, and the rest of the enable signal terminals are connected with the control circuit 11;

the signal input ends of the multiple paths are used for receiving a plurality of first level driving signals in at least one path of first level driving signals, and the signal output ends of the multiple paths are used for outputting x paths of third level driving signals to one end of the corresponding x paths of LED lamps 13;

the first level shifter 1211 is used for inverting the first level driving signal;

the multi-channel gate driver 1212 is triggered to turn on the corresponding signal output terminal by a level combination state of the first level driving signal received by the enable signal terminal and the level driving signal outputted by the first level shifter 1211.

In this embodiment, it should be noted that the first level shifter 1211 may be any electronic device or circuit capable of inverting the level, the multi-channel gate driver 1212 may be any electronic device having an enable terminal, multiple enable signal terminals may be all connected to the control circuit 11 through the first level shifter 1211, may be partially connected to the control circuit 11 through the first level shifter 1211, and the rest may be directly connected to the control circuit 11, multiple enable signal terminals and multiple signal input terminals of the multi-channel gate driver 1212 may receive the same path of the first level driving signal, may receive different paths of the first level driving signals, the number of the signal input terminals, the enable signal terminals and the signal output terminals may be the same as or different from the number of the LED lamps 13, the multi-channel gate driver 1212 may turn on the corresponding signal output terminals when the enable signal terminals receive the high level, or turn on the corresponding signal output terminals when the enable signal terminals receive the low level, as shown in fig. 4, optionally, the multi-channel gate driver 1212 has four signal input terminals, A1, A2, A3 and A4, respectively, the multi-channel gate driver 1212 has four enable signal terminals, OE1, OE2, OE3 and OE4, respectively, the multi-channel gate driver 1212 has four signal output terminals, Y1, Y2, Y3 and Y4, A1, OE1 and Y1, A2, and Y2, A3, OE3 and Y3, A4, OE4 and Y4, respectively.

OE3 and OE4 are connected to GPIO3 of the control circuit 11 through the first level shifter 1211, and OE1 and OE2 are directly connected to GPIO3 of the control circuit 11.

Four signal input ends A1, A2, A3 and A4 are used for receiving one of four first level driving signals, in particular to a first level driving signal output by GPIO4, four signal output ends Y1, Y2, Y3 and Y4 are used for outputting four third level driving signals to anodes of corresponding four LED lamps 13, wherein Y1 is output to LED4, Y2 is output to LED2, Y3 is output to LED3, and Y4 is output to LED1.

The multi-channel gate driver 1212 is triggered to turn on the corresponding signal output terminal by the level combination state of the first level driving signal received by the four enable signal terminals OE1, OE2, OE3, OE4 and the level driving signal outputted by the first level shifter 1211, optionally, when the driving signal received by the enable signal terminal is at a high level, the corresponding signal output terminal is turned off, and when the driving signal received by the enable signal terminal is at a low level, the corresponding signal output terminal is turned on.

By connecting a plurality of the enable signal terminals of the plurality of enable signal terminals with the control circuit 11 through the first level shifter 1211, and connecting the rest of the enable signal terminals with the control circuit 11, the level driving signals received by the plurality of enable signal terminals can be in different level combination states, so that the multi-channel gate driver 1212 conducts different signal output terminals, and driving of one end of different LED lamps 13 is realized.

Optionally, the first level shifter 1211 includes at least one first not gate.

In this embodiment, it should be noted that the number of the first not gates may be one or a plurality, specifically determined according to the space size of the circuit and the number of the enable signal terminals to be connected, and optionally, the first level shifter 1211 includes a first not gate, and by setting the first not gate, the first level shifter 1211 can implement a level flipping function, that is, if the first level shifter 1211 inputs a high level, a low level is output, and if the first level shifter 1211 inputs a low level, a high level is output.

Optionally, the logic output circuit 122 includes a first logic circuit 1221, a second logic circuit 1222, and a second level shifter 1223;

an input end of the first logic circuit 1221 is connected with the control circuit 11, an output end of the first logic circuit 1221 is connected with an input end of the second level shifter 1223, and an output end of the second level shifter 1223 is connected with the other end of the LED lamp 13;

An input end of the second logic circuit 1222 is connected with the control circuit 11, and an output end of the second logic circuit 1222 is connected with the other end of the LED lamp 13;

the first logic circuit 1221 is configured to receive a plurality of the first level driving signals in at least one of the first level driving signals, and convert and output a fifth level driving signal to the second level converter 1223, where the fifth level driving signal is a high level or a low level;

the second level shifter 1223 is configured to flip the fifth level driving signal and output k paths of the fourth level driving signal to the other end of the corresponding k paths of the LED lamps 13, where k < n;

The second logic circuit 1222 is configured to receive a plurality of the first level driving signals in at least one path of the first level driving signals, and convert and output n-k paths of the fourth level driving signals to the other end of the LED lamp 13 corresponding to the n-k paths.

In this embodiment, it should be noted that, the first logic circuit 1221 and the second logic circuit 1222 may receive at least one of the first level driving signals, different ones of the first level driving signals, or the same ones of the first level driving signals, as shown in fig. 4, optionally, an input end of the first logic circuit 1221 is connected to GPIO1 and GPIO2 of the control circuit 11, so that the first logic circuit 1221 receives two first level driving signals output by GPIO1 and GPIO2 in four first level driving signals, and the second level converter 1223 outputs two fourth level driving signals to cathodes of the corresponding two LED lamps 13, specifically, cathodes of LED1 and LED 2.

The input end of the second logic circuit 1222 is connected to GPIO1 and GPIO2 of the control circuit 11, so that the second logic circuit 1222 receives two paths of first level driving signals output by GPIO1 and GPIO2 in four paths of first level driving signals, and converts and outputs two paths of fourth level driving signals to cathodes of corresponding two paths of LED lamps 13, specifically, cathodes of LED3 and LED 4.

By connecting the input terminal of the first logic circuit 1221 to the control circuit 11, the output terminal of the first logic circuit 1221 is connected to the input terminal of the second level shifter 1223, the output terminal of the second level shifter 1223 is connected to the other end of the LED lamp 13, the input terminal of the second logic circuit 1222 is connected to the control circuit 11, and the output terminal of the second logic circuit 1222 is connected to the other end of the LED lamp 13, so that the logic output circuit 122 can output different level combination states, thereby realizing driving of the other end of the LED lamp 13.

Optionally, the first logic circuit 1221 includes at least one exclusive or gate correspondingly connected to the control circuit 11.

In this embodiment, the number of the exclusive or gates may be one or a plurality, and is specifically determined according to the space size of the circuit and the number of the LED lamps 13 to be driven, and optionally, the first logic circuit 1221 includes an exclusive or gate connected to the GPIO1 and the GPIO2 of the control circuit 11, and by setting the exclusive or gate, the first logic circuit 1221 can output a low level when the inputs of the first logic circuit 1221 are the same, and output a high level when the inputs of the first logic circuit 1221 are different.

Optionally, the second logic circuit 1222 includes at least one or gate correspondingly connected to the control circuit 11.

In this embodiment, the number of the or gates may be one or more, specifically determined according to the space size of the circuit and the number of the LED lamps 13 to be driven, and optionally, the second logic circuit 1222 includes an or gate connected to the GPIO1 and the GPIO2 of the control circuit 11, and by setting the or gate, the low level is output only when the inputs of the second logic circuit 1222 are all low, and the high level is output in the rest cases.

Optionally, the second level shifter 1223 includes at least one second not gate correspondingly connected to the first logic circuit 1221.

In this embodiment, the number of the second not gates may be one or more, specifically determined according to the space size of the circuit and the number of the LED lamps 13 to be connected, and optionally, the second level shifter 1223 includes a second not gate connected to the output terminal of the first logic circuit 1221, and by setting the second not gate, the second level shifter 1223 can implement a level flipping function, that is, if the second level shifter 1223 inputs a high level, a low level is output, and if the second level shifter 1223 inputs a low level, a high level is output.

Taking fig. 4 as an example, table 1 shows a driving method of the LED driving circuit according to the present embodiment, wherein 1 represents a high level, 0 represents a low level, 0 (1) represents a low level or a high level, 1 (0) represents a high level or a low level, and 0/1 represents alternately outputting a low level and a high level.

GPIO1

GPIO2

GPIO3

GPIO4

LED1

LED2

LED3

LED4

1

Is not limited to

Extinguishing device

0

1

Extinguishing device

Lighting up

Extinguishing device

0

1

0/1

Extinguishing device

Flicker and flash

Extinguishing device

0(1)

1(0)

1

Lighting up

Extinguishing device

0(1)

1(0)

1

0/1

Flicker and flash

Extinguishing device

0

1

Extinguishing device

Lighting up

0

0/1

Extinguishing device

Flicker and flash

0(1)

1(0)

0

1

Extinguishing device

Lighting up

Extinguishing device

0(1)

1(0)

0

0/1

Extinguishing device

Flicker and flash

Extinguishing device

TABLE 1

As shown in table 1, when GPIO1 and GPIO2 output high levels, the first logic circuit 1221 outputs a low level to the second level shifter 1223, the second level shifter 1223 outputs a high level to the cathodes of LED1 and LED2, and the second logic circuit 1222 outputs a high level to the cathodes of LED3 and LED4, and then the LEDs 1 to 4 are turned off regardless of whether GPIO3 and GPIO4 output high levels or low levels.

When GPIO1 outputs a low level, GPIO2, GPIO3 and GPIO4 outputs a high level, or GPIO2 outputs a low level, GPIO1, GPIO3 and GPIO4 outputs a high level, OE1 and OE2 receive a high level such that Y1 and Y2 are turned off, LED2 and LED4 are turned off, OE3 and OE4 receive a low level, Y3 and Y4 are turned on and output a high level to anodes of LED1 and LED3, first logic circuit 1221 outputs a high level to second logic circuit 1223, second logic circuit 1223 outputs a low level to cathodes of LED1 and LED2, LED1 is turned on, second logic circuit 1222 outputs a high level to cathodes of LED3 and LED4, LED3 is turned off, and further, if GPIO4 outputs a square wave, i.e., alternately outputs a low level and a high level, LED1 blinks.

When GPIO1 and GPIO3 output low level, GPIO2 and GPIO4 output high level, or GPIO2 and GPIO3 output low level, GPIO1 and GPIO4 output high level, OE3 and OE4 receive high level so that Y3 and Y4 are turned off, LED1 and LED3 are turned off, OE1 and OE2 receive low level, Y1 and Y2 are turned on and output high level to anode of LED2 and LED4, first logic circuit 1221 outputs high level to second level converter 1223, second level converter 1223 outputs low level to cathode of LED1 and LED2, LED2 is turned on, second logic circuit 1222 outputs high level to cathode of LED3 and LED4, LED4 is turned off, further LED2 blinks if GPIO4 outputs square wave, i.e. alternately outputs low level and high level.

When GPIO1 and GPIO2 output low level, GPIO3 and GPIO4 output high level, OE1 and OE2 receive high level so that Y1 and Y2 are turned off, LED2 and LED4 are turned off, OE3 and OE4 receive low level, Y3 and Y4 are turned on and output high level to anode of LED1 and LED3, first logic circuit 1221 outputs low level to second level converter 1223, second level converter 1223 outputs high level to cathode of LED1 and LED2, LED1 is turned off, second logic circuit 1222 outputs low level to cathode of LED3 and LED4, LED3 is turned on, further, if GPIO4 outputs square wave, i.e., alternately outputs low level and high level, LED3 blinks.

When GPIO1, GPIO2, and GPIO3 output low level and GPIO4 output high level, OE3 and OE4 receive high level such that Y3 and Y4 are turned off, LED1 and LED3 are turned off, OE1 and OE2 receive low level, Y1 and Y2 are turned on and output high level to anode of LED2 and LED4, first logic circuit 1221 outputs low level to second level converter 1223, second level converter 1223 outputs high level to cathode of LED1 and LED2, LED2 is turned off, second logic circuit 1222 outputs low level to cathode of LED3 and LED4, LED4 is turned on, and further, if GPIO4 outputs square wave, i.e., alternately outputs low level and high level, LED4 blinks.

The LED driving circuit provided in this embodiment realizes driving of four-way LED lamps 13 by one control circuit 11 having four output terminals.

Example two

Referring to fig. 5, another LED driving circuit is provided in this embodiment, which is different from the first embodiment in that the control circuit 11 has three output terminals, i.e. GPIO1, GPIO2 and GPIO3, so that the control circuit 11 can output three first level driving signals, and the driving circuit 12 outputs six second level driving signals to the corresponding three LED lamps 13 to drive the three LED lamps 13 to be correspondingly turned on or off. The six paths of second level driving signals comprise three paths of third level driving signals and three paths of fourth level driving signals which are respectively and correspondingly output to two ends of the three paths of LED lamps 13.

The gate output circuit 121 is configured to gate and output three third level driving signals to one end of the LED lamp 13 corresponding to the three third level driving signals under the level combination state of one of the three first level driving signals, specifically, the first level driving signal output by the GPIO 3.

The logic output circuit 122 receives two paths of the first level driving signals, specifically, the level combination logic conversion of the first level driving signals output by the GPIO1 and the GPIO2, and outputs three paths of the fourth level driving signals to the other ends of the corresponding three paths of the LED lamps 13.

The multi-channel gate driver 1212 has three signal input terminals A1, A2, and A3, respectively, the multi-channel gate driver 1212 has three enable signal terminals OE1, OE2, and OE3, respectively, the multi-channel gate driver 1212 has three signal output terminals Y1, Y2, and Y3, respectively, corresponding to A1, OE1, and Y1, corresponding to A2, OE2, and Y2, and corresponding to A3, OE3, and Y3.

OE1 to OE3 are each connected to GPIO3 of the control circuit 11 through the first level shifter 1211.

Three signal input ends A1, A2 and A3 are used for receiving one of the three first level driving signals, in particular the first level driving signal output by the GPIO3, and three signal output ends Y1, Y2 and Y3 are used for outputting three third level driving signals to anodes of the corresponding three LED lamps 13, wherein Y1 is output to the LED3, Y2 is output to the LED1, and Y3 is output to the LED2.

The multi-channel gate driver 1212 is triggered to turn on the corresponding signal input terminal and signal output terminal by the level combination state of the level driving signal output from the first level shifter 1211 received by the three enable signal terminals OE1, OE2, OE 3.

The input end of the first logic circuit 1221 is connected to the GPIO1 and GPIO2 of the control circuit 11, so that the first logic circuit 1221 receives two paths of first level driving signals output by the GPIO1 and GPIO2 in three paths of first level driving signals, and the second level converter 1223 outputs a path of fourth level driving signals to the cathode of the corresponding path of LED lamp 13, specifically, the cathode of the LED 1.

The input end of the second logic circuit 1222 is connected to GPIO1 and GPIO2 of the control circuit 11, so that the second logic circuit 1222 receives two paths of first level driving signals output by GPIO1 and GPIO2 in three paths of first level driving signals, and converts and outputs two paths of fourth level driving signals to cathodes of corresponding two paths of LED lamps 13, specifically, cathodes of LED2 and LED 3.

Taking fig. 5 as an example, table 2 shows a driving method of the LED driving circuit according to the present embodiment, wherein 1 represents a high level, 0 represents a low level, 0 (1) represents a low level or a high level, 1 (0) represents a high level or a low level, and 0/1 represents an alternate output of a low level and a high level.

GPIO1	GPIO2	GPIO3	LED1	LED2	LED3
						1	1	Is not limited to	Extinguishing device	Extinguishing device	Extinguishing device
0	0	1	Extinguishing device	Lighting up	Lighting up
						0	0	0/1	Extinguishing device	Flicker and flash	Flicker and flash
0(1)	1(0)	1	Lighting up	Extinguishing device	Extinguishing device
						0(1)	1(0)	0/1	Flicker and flash	Extinguishing device	Extinguishing device

TABLE 2

As shown in table 2, when GPIO1 and GPIO2 output high levels, the first logic circuit 1221 outputs low level to the second level shifter 1223, the second level shifter 1223 outputs high level to the cathode of LED1, and the second logic circuit 1222 outputs high level to the cathodes of LED2 and LED3, and LEDs 1 to 3 are turned off regardless of whether GPIO3 outputs high level or low level.

When GPIO1 outputs a low level, GPIO2 and GPIO3 outputs a high level, or GPIO1 and GPIO3 output a high level, GPIO2 outputs a low level, OE1, OE2 and OE3 receive the low level, Y1, Y2 and Y3 are turned on and output the high level to anodes of LED1, LED2 and LED3, the first logic circuit 1221 outputs the high level to the second level converter 1223, the second level converter 1223 outputs the low level to the cathode of LED1, LED1 is turned on, the second logic circuit 1222 outputs the high level to the cathodes of LED2 and LED3, LED2 and LED3 are turned off, and further, if GPIO3 outputs square waves, i.e., alternately outputs the low level and the high level, LED1 blinks.

When GPIO1 and GPIO2 output low level and GPIO3 output high level, OE1, OE2 and OE3 receive low level, Y1, Y2 and Y3 are turned on and output high level to anode of LED1, LED2 and LED3, first logic circuit 1221 outputs low level to second level converter 1223, second level converter 1223 outputs high level to cathode of LED1, LED1 is turned off, second logic circuit 1222 outputs low level to cathode of LED2 and LED3, LED2 and LED3 are turned on, further, if GPIO3 outputs square wave, i.e. alternately outputs low level and high level, LED2 and LED3 are turned on.

The LED driving circuit provided in this embodiment realizes driving of three paths of LED lamps 13 by a control circuit 11 having three output terminals.

Example III

Referring to fig. 6, another LED driving circuit is provided in this embodiment, which is different from embodiment 1 in that the control circuit 11 has three output terminals, i.e. GPIO1, GPIO2 and GPIO3, respectively, so that the control circuit 11 can output three first level driving signals.

The gate output circuit 121 is configured to gate and output four paths of the third level driving signals to one end of the LED lamp 13 corresponding to the four paths of the first level driving signals, specifically, the level combination state of the first level driving signals output by the GPIO 3.

The logic output circuit 122 receives two paths of the first level driving signals, specifically, the level combination logic conversion of the first level driving signals output by the GPIO1 and the GPIO2, and outputs four paths of the fourth level driving signals to the other ends of the corresponding four paths of the LED lamps 13.

OE1 to OE4 are each connected to GPIO3 of the control circuit 11 through the first level shifter 1211.

Four signal input ends A1, A2, A3 and A4 are used for receiving one of the four first level driving signals, specifically the first level driving signal output by GPIO 3.

The multi-channel gate driver 1212 is triggered to turn on the corresponding signal input terminal and signal output terminal by the level combination state of the level driving signal output from the first level shifter 1211 received by the four enable signal terminals OE1, OE2, OE3, OE 4.

Taking fig. 6 as an example, table 3 shows a driving method of the LED driving circuit according to the present embodiment, wherein 1 represents a high level, 0 represents a low level, 0 (1) represents a low level or a high level, 1 (0) represents a high level or a low level, and 0/1 represents an alternate output of a low level and a high level.

GPIO1

GPIO2

GPIO3

LED1

LED2

LED3

LED4

1

Is not limited to

Extinguishing device

0

1

Extinguishing device

Lighting up

0

0/1

Extinguishing device

Flicker and flash

0(1)

1(0)

1

Lighting up

Extinguishing device

0(1)

1(0)

0/1

Flicker and flash

Extinguishing device

TABLE 3 Table 3

As shown in table 3, when GPIO1 and GPIO2 output high levels, the first logic circuit 1221 outputs a low level to the second level shifter 1223, the second level shifter 1223 outputs a high level to the cathodes of LED1 and LED2, and the second logic circuit 1222 outputs a high level to the cathodes of LED3 and LED4, and LEDs 1 to 4 are turned off regardless of whether GPIO3 outputs a high level or a low level.

When GPIO1 outputs a low level, GPIO2 and GPIO3 outputs a high level, or GPIO1 and GPIO3 output a high level, GPIO2 outputs a low level, OE1 to OE4 each receive a low level, Y1 to Y4 are turned on and output a high level to anodes of LED1, LED2, LED3 and LED4, first logic circuit 1221 outputs a high level to second level shifter 1223, second level shifter 1223 outputs a low level to cathodes of LED1 and LED2, LEDs 1 and LED2 are turned on, second logic circuit 1222 outputs a high level to cathodes of LED3 and LED4, LEDs 3 and LED4 are turned off, and further, if GPIO3 outputs square waves, i.e., alternately outputs a low level and a high level, LEDs 1 and LED2 are turned off.

When the GPIO1 and the GPIO2 output low levels and the GPIO3 outputs high levels, the OE1 to OE4 each receive low levels, the Y1 to Y4 are turned on and output high levels to anodes of the LED1, the LED2, the LED3 and the LED4, the first logic circuit 1221 outputs low levels to the second level converter 1223, the second level converter 1223 outputs high levels to cathodes of the LED1 and the LED2, the LED1 and the LED2 are turned off, the second logic circuit 1222 outputs low levels to cathodes of the LED3 and the LED4, the LED3 and the LED4 are turned on, and further, if the GPIO3 outputs square waves, i.e., alternately outputs low levels and high levels, the LED3 and the LED4 are turned on.

The LED driving circuit provided in this embodiment realizes driving of four-way LED lamps 13 by one control circuit 11 having three output terminals.

Example IV

As shown in fig. 7, the second aspect of the embodiment of the present invention provides an LED assembly, where the LED assembly includes an LED driving circuit and a plurality of LED lamps, and the specific structure of the LED driving circuit refers to the above embodiment. The LED driving circuit is correspondingly connected with a plurality of LED lamps.

In this embodiment, LED lamp and LED drive circuit constitute the LED subassembly, realize work such as illumination, demonstration to, in the LED subassembly, only need set up the drive work that a plurality of LED lamps can be accomplished to one way LED drive circuit, simplified the structure of LED subassembly and reduced the design cost, wherein, the LED subassembly can be structures such as light, backlight, display screen, and specific structure is not limited.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.

Claims

1. An LED driving circuit, comprising:

the driving circuit is connected with the control circuit, and triggered by the level combination state of at least one path of first level driving signals to output m paths of second level driving signals to the corresponding n paths of LED lamps so as to drive the n paths of LED lamps to correspondingly light up or turn off, wherein the second level driving signals are high level or low level, and m is more than or equal to n;

The m paths of second level driving signals comprise x paths of third level driving signals which are respectively and correspondingly output to one ends of the x paths of LED lamps, and n paths of fourth level driving signals at the other ends of the n paths of LED lamps, wherein the third level driving signals are high level or low level, and the fourth level driving signals are high level or low level, and x is less than or equal to n;

the driving circuit includes:

The logic output circuit is connected with the control circuit, and is subjected to level combination logic conversion of a plurality of paths of first level driving signals in at least one path of first level driving signals to output n paths of fourth level driving signals to the other ends of the corresponding n paths of LED lamps;

the LED driving circuit drives the LED lamp from two ends of the LED lamp;

wherein the strobe output circuit and the logic output circuit are integrated;

the multi-channel gating driver comprises a multi-channel signal input end, a multi-channel enabling signal end and a multi-channel signal output end, wherein the signal input end, the enabling signal end and the signal output end are in one-to-one correspondence;

The multi-channel gating driver is triggered to conduct a corresponding signal output end by the level combination state of the first level driving signal received by the multi-channel enabling signal end and the level driving signal output by the first level converter;

the logic output circuit comprises a first logic circuit, a second logic circuit and a second level converter;

the second logic circuit is used for receiving a plurality of paths of first level driving signals in at least one path of first level driving signals, and converting and outputting n-k paths of fourth level driving signals to the other end of the corresponding n-k paths of LED lamps;

If the level combination state of the four first level driving signals is high level, unlimited level and unlimited level, the states of the 4 LEDs corresponding to the level combination state of the four first level driving signals are off, off and off respectively;

If the level combination state of the four first level driving signals is low level, high level and high level, the states of the 4 LEDs corresponding to the level combination state of the four first level driving signals are off, on and off respectively;

If the level combination state of the four first level driving signals output by the control circuit is low level, high level and alternately outputs low level and high level, the states of the 4 LEDs corresponding to the level combination state of the four first level driving signals are off, flashing and off respectively;

If the level combination state of the four paths of the first level driving signals is low level, high level and high level, or is high level, low level, high level and high level, the states of the 4 paths of LEDs corresponding to the level combination state of the four paths of the first level driving signals are on, off and off respectively;

if the level combination state of the four paths of the first level driving signals output by the control circuit is low level, high level and high level, or is high level, low level and high level, and alternately outputs low level and high level, the states of the 4 paths of LEDs corresponding to the level combination state of the four paths of the first level driving signals are respectively flashing, extinguishing and extinguishing;

if the level combination state of the four first level driving signals is low level, low level and high level, the states of the 4 LEDs corresponding to the level combination state of the four first level driving signals are off, off and on respectively;

if the level combination state of the four first level driving signals output by the control circuit is low level, low level and alternately outputs low level and high level, the states of the 4 LEDs corresponding to the level combination state of the four first level driving signals are off, off and flashing respectively;

If the level combination state of the four paths of the first level driving signals is low level, high level, low level and high level, or is high level, low level and high level, the states of the 4 paths of LEDs corresponding to the level combination state of the four paths of the first level driving signals are off, on, off and off respectively;

If the level combination state of the four first level driving signals outputted by the control circuit is low level, high level, low level, or high level, low level, and alternatively outputs low level and high level, the states of the 4 LEDs corresponding to the level combination state of the four first level driving signals are off, flash, off, and off, respectively.

2. The LED driving circuit of claim 1, wherein the first level shifter comprises at least one first not gate.

3. The LED driving circuit of claim 1, wherein the first logic circuit comprises at least one xor gate correspondingly connected to the control circuit.

4. The LED driving circuit of claim 1, wherein the second logic circuit comprises at least one or gate correspondingly connected to the control circuit.

5. The LED driving circuit of claim 1, wherein the second level shifter includes at least one second not gate correspondingly connected to the first logic circuit.

6. An LED assembly comprising a plurality of LED lamps and an LED driving circuit according to any one of claims 1 to 5, said LED driving circuit being correspondingly connected to a plurality of said LED lamps.