CN114390751A

CN114390751A - LED drive circuit and LED subassembly

Info

Publication number: CN114390751A
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: 2022-04-22
Anticipated expiration: 2041-12-27
Also published as: CN114390751B

Abstract

The invention provides an LED drive circuit and an LED assembly, wherein the LED drive 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 levels or low levels; and the driving circuit is triggered by the level combination state of at least one path of first level driving signal 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 be correspondingly lightened or extinguished, and the second level driving signal is high level or low level, wherein m is more than or equal to n. The LED lamp driving circuit can drive more LED lamps by using fewer control circuits, thereby simplifying the structure of the circuit, improving the utilization rate of the control circuits, saving the space occupied by the whole circuit, and simultaneously reducing the production process and the manufacturing cost.

Description

LED drive circuit and LED subassembly

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

At present, light emitting diodes, i.e., LEDs, are increasingly used. The LED lamp has one-way conductivity, namely, when a forward voltage is applied to the anode and the cathode of the LED, the LED lamp is lightened, and when a reverse voltage is applied to the anode and the cathode, the LED lamp is extinguished.

Generally, a controller is arranged on each LED lamp, so that the structure of the whole circuit becomes complex, the utilization rate of the controller is low, the occupied space of the whole circuit is large, and meanwhile, the production process and the manufacturing cost are correspondingly improved. When the number of the controller and the terminals thereof is not enough and the number of the LED lamps is more, the driving effect can not be ensured.

Therefore, the traditional technical scheme has the problems that 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 of the controller is insufficient and the number of the LED lamps is large, 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 levels or low levels;

and the driving circuit is triggered by the level combination state of at least one path of the first level driving signal 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 be correspondingly lightened or extinguished, and the second level driving signal is at a high level or a low level, wherein m is more than or equal to n.

In one embodiment, the m paths of second level driving signals include x paths of third level driving signals and n paths of fourth level driving signals, the x paths of third level driving signals and the n paths of fourth level driving signals are respectively and correspondingly output to one end of the x paths of LED lamps, the third level driving signals are at a high level or a low level, the fourth level driving signals are at a high level or a 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 gates and outputs x paths of the third level driving signals to one end of the corresponding x paths of the LED lamps by the level combination state of a plurality of paths of the first level driving signals in at least one path of the first level driving signals;

and the logic output circuit is connected with the control circuit and is used for outputting n paths of fourth level driving signals to the other end 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, the multi-channel gate driver comprises a multi-channel signal input end, a multi-channel enable signal end and a multi-channel signal output end, and the signal input end, the enable 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 shifter, and the rest enable signal ends are connected with the control circuit;

the multiple 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 multiple 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 inverting the first level driving signal;

and the multichannel gating driver is triggered by the level combination state of the first level driving signal received by the multiple paths of enabling signal ends and the level driving signal output by the first level converter to conduct the corresponding signal output end.

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 shifter, and the output end of the second level shifter 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 first level driving signals in at least one first level driving signal, and convert and output a fifth level driving signal to the second level converter, where the fifth level driving signal is at a high level or a low level;

the second level shifter is used for inverting the fifth level driving signal and outputting k paths of the fourth level driving signals to the other end of the corresponding k paths of the LED lamps, wherein k is less than n;

the second logic circuit is used for receiving a plurality 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 connected to the control circuit.

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

In one embodiment, the second level shifter includes at least one second not gate connected in correspondence with the first logic circuit.

A second aspect of the embodiments of the present invention provides an LED assembly, which includes a plurality of LED lamps and the LED driving circuit as described above, and 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 following beneficial effects: the LED driving circuit is connected with the driving circuit through the control circuit which outputs at least one path of first level driving signals, the driving circuit outputs m paths of second level driving signals to the corresponding n paths of LED lamps, and more LED lamps can be driven by fewer control circuits, so that the structure of the circuit is simplified, the utilization rate of the control circuit is improved, the space occupied by the whole circuit is saved, the production process and the manufacturing cost are reduced, and when the number of the control circuit and the number of the terminals of the control circuit are insufficient and the number of the LED lamps is more, the driving effect can still be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

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 solutions and advantageous effects to be solved by the present invention more clearly apparent, the present 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 merely illustrative of the invention and are not intended to limit the invention.

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

Example one

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

the control circuit 11 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 12 is connected with the control circuit 11, and the driving circuit 12 is triggered by the level combination state of at least one path of the first level driving signal to output m paths of second level driving signals to the corresponding n paths of the LED lamps 13 so as to drive the n paths of the LED lamps 13 to be correspondingly turned on or turned off, wherein the second level driving signals are high levels or low levels, and 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, or the like, and has at least one output end for outputting at least one first level driving signal, the driving circuit 12 may have a gating and logic converting function, a gating module and a logic converting module of the driving circuit may be integrated or separated, and the number of the output ends is greater than the number of the input ends, so that a smaller number of the first level driving signals output a larger number of second level driving signals after passing through the driving circuit 12, and m and n may be any positive integer, as shown in fig. 2, optionally, the control circuit 11 has four output ends, which are GPIO1, GPIO2, GPIO3, and GPIO4, so that the control circuit 11 can output at least one first level driving signal, and the driving circuit 12 can output at least eight second level driving signals to corresponding four LED lamps 13, so as to drive four paths of the LED lamps 13 to be correspondingly turned on or off.

The control circuit 11 outputting at least one path of first level driving signals is connected 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 more LED lamps 13 can be driven by fewer control circuits 11, so that the structure of the circuit is simplified, the utilization rate of the control circuit 11 is improved, the space occupied by the whole circuit is saved, and meanwhile, the production process and the manufacturing cost are reduced.

Optionally, the m paths of second level driving signals include x paths of third level driving signals respectively and correspondingly 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 at a high level or a low level, and the fourth level driving signals are at a high level or a low level, where x is equal to or less than n.

In this embodiment, it should be noted that the gating module of the driving circuit 12 outputs the third level driving signal, 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, optionally, 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.

The m paths of second level driving signals are respectively and correspondingly output to one end of the x paths of LED lamps 13 and the other end of the n paths of LED lamps 13, and 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 gates and outputs x paths of the third level driving signals to one end of the corresponding x paths of the LED lamps 13 by a level combination state of a plurality of paths of the first level driving signals in at least one path of the first level driving signals;

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

In this embodiment, it should be noted that the gating 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 gating output circuit 121 gates up to 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 GPIO3 and GPIO4, and the logic output circuit 122 converts the four fourth level driving signals to the other end of the corresponding four LED lamps 13 by a level combination logic of the first level driving signals output by GPIO1 and GPIO 2.

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

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

a plurality of enable signal terminals of the plurality of enable signal terminals are connected to the control circuit 11 through the first level shifter 1211, and the rest of the enable signal terminals are connected to the control circuit 11;

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

the first level shifter 1211 is configured to invert the first level driving signal;

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 multiple paths of enable signal terminals and the level driving signal output by the first level shifter 1211.

In this embodiment, it should be noted that the first level converter 1211 can be any electronic device or circuit capable of inverting a level, the multi-channel gate driver 1212 can be any electronic device having an enable terminal, multiple enable signal terminals can be all connected to the control circuit 11 through the first level converter 1211, or multiple enable signal terminals can be partially connected to the control circuit 11 through the first level converter 1211, and the rest of the terminals are directly connected to the control circuit 11, multiple enable signal terminals and multiple signal input terminals of the multi-channel gate driver 1212 can receive the same path of the first level driving signal, or can receive different paths of the first level driving signal, the number of the signal input terminals, the number of the enable signal terminals, and the number of the signal output terminals can be the same as the number of the LED lamps 13, alternatively, the multi-channel gate driver 1212 may turn on the corresponding signal output terminal when the enable signal terminal receives a high level, or turn on the corresponding signal output terminal when the enable signal terminal receives a low level, as shown in fig. 4, optionally, the multi-channel gate driver 1212 has four signal input terminals, which are a1, a2, A3 and a4, the multi-channel gate driver 1212 has four enable signal terminals, which are OE1, OE2, OE3 and OE4, the multi-channel gate driver 1212 has four signal output terminals, which are Y1, Y2, Y3 and Y4, a1, OE1 and Y1 correspond, a2, OE2 and Y2 correspond, A3, OE3 and Y3 correspond, and a4, OE4 and Y4 correspond.

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.

The four signal input ends a1, a2, A3, and a4 are configured to receive one of the four first level driving signals, specifically, the first level driving signal output by GPIO4, and the four signal output ends Y1, Y2, Y3, and Y4 are configured to output four third level driving signals to the anodes of the corresponding four LED lamps 13, where Y1 is output to the LED4, Y2 is output to the LED2, Y3 is output to the LED3, and Y4 is output to the LED 1.

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 and OE4 and the level driving signal output by the first level shifter 1211, and 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 some of the multiple enable signal terminals to the control circuit 11 through the first level converter 1211, and connecting the remaining enable signal terminals to the control circuit 11, the level driving signals received by the multiple enable signal terminals can be in different level combination states, so that the multi-channel gate driver 1212 turns on different signal output terminals, and drives different one ends of the LED lamp 13.

Optionally, the first level converter 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 multiple, and is 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 converter 1211 includes a first not gate, and the first level converter 1211 can implement a level inversion function by setting the first not gate, that is, if the input of the first level converter 1211 is a high level, a low level is output, and if the input of the first level converter 1211 is a low level, a high level is output.

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

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

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

the first logic circuit 1221 is configured to receive a plurality of 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 shifter 1223, where the fifth level driving signal is at a high level or a low level;

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

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

In this embodiment, it should be noted that the first logic circuit 1221 and the second logic circuit 1222 may receive different ones of the first level driving signals, or may receive 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 shifter 1223 outputs two fourth level driving signals to corresponding cathodes of the two LED lamps 13, specifically, cathodes of the LED1 and the 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 first level driving signals output by GPIO1 and GPIO2 in the four first level driving signals, and converts and outputs two fourth level driving signals to the cathodes of the two corresponding LED lamps 13, specifically the cathodes of the LED3 and the 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 to the input terminal of the second level shifter 1223, the output terminal of the second level shifter 1223 to the other end of the LED lamp 13, the input terminal of the second logic circuit 1222 to the control circuit 11, and the output terminal of the second logic circuit 1222 to the other end of the LED lamp 13, the logic output circuit 122 can output different level combination states, and thus drive the other end of the LED lamp 13 differently.

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

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

In this embodiment, it should be noted that the number of the or gates may be one or multiple, and is specifically determined according to the space size of the circuit and the number of the LED lamps 13 that need to be driven, and optionally, the second logic circuit 1222 includes an or gate connected to GPIO1 and GPIO2 of the control circuit 11, and by setting the or gate, the second logic circuit 1222 outputs a low level when the input of the second logic circuit 1222 is a low level, and outputs a high level when the input of the second logic circuit 1222 is a high level.

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

In this embodiment, it should be noted that the number of the second not gates may be one or multiple, and is specifically determined according to the space size of the circuit and the number of the LED lamps 13 that need to be connected, and optionally, the second level shifter 1223 includes a second not gate connected to the output end of the first logic circuit 1221, and by setting the second not gate, the second level shifter 1223 can implement a level inversion function, that is, if the input of the second level shifter 1223 is a high level, a low level is output, and if the input of the second level shifter 1223 is 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 provided in this embodiment, where 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

Without limitation

Extinguishment of

0

1

Extinguishment of

Lighting up

Extinguishment of

0

1

0/1

Extinguishment of

Flashing

Extinguishment of

0(1)

1(0)

1

Lighting up

Extinguishment of

0(1)

1(0)

1

0/1

Flashing

Extinguishment of

0

1

Extinguishment of

Lighting up

0

0/1

Extinguishment of

Flashing

0(1)

1(0)

0

1

Extinguishment of

Lighting up

Extinguishment of

0(1)

1(0)

0

0/1

Extinguishment of

Flashing

Extinguishment of

TABLE 1

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

When GPIO1 outputs a low level and GPIO2, GPIO3 and GPIO4 output a high level, or GPIO2 outputs a low level and GPIO1, GPIO3 and GPIO4 output a high level, OE1 and OE2 receive a high level so 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 the anodes of LED1 and LED3, first logic circuit 1221 outputs a high level to second level converter 1223, second level converter 1223 outputs a low level to the cathodes of LED1 and LED2, LED1 is turned on, second logic circuit 1222 outputs a high level to the cathodes of LED3 and LED4, LED3 is turned off, and further, if GPIO4 outputs a square wave, that is, alternately outputting a low level and a high level, LED1 blinks.

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

When GPIO1 and GPIO2 output a low level and GPIO3 and GPIO4 output a high level, OE1 and OE2 receive a high level so 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 the anodes of LED1 and LED3, first logic circuit 1221 outputs a low level to second level shifter 1223, second level shifter 1223 outputs a high level to the cathodes of LED1 and LED2, LED1 is turned off, second logic circuit 1222 outputs a low level to the cathodes of LED3 and LED4, LED3 is turned on, and further, if 4 outputs a square wave, that is, alternately outputs a low level and a high level, LED3 blinks.

When GPIO1, GPIO2, and GPIO3 output a low level and GPIO4 outputs a high level, OE3 and OE4 receive a high level so that Y3 and Y4 are turned off, LED1 and LED3 are turned off, OE1 and OE2 receive a low level, Y1 and Y2 are turned on and output a high level to anodes of LED2 and LED4, first logic circuit 1221 outputs a low level to second level shifter 1223, second level shifter 1223 outputs a high level to cathodes of LED1 and LED2, LED2 is turned off, second logic circuit 1222 outputs a low level to cathodes of LED3 and LED4, LED4 is turned on, and further, if 4 outputs a square wave, that is, alternately outputs a low level and a high level, LED4 blinks.

The LED driving circuit provided in this embodiment drives the four-way LED lamp 13 through a control circuit 11 having four output ends.

Example two

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

The gating output circuit 121 gates and outputs three paths of the third level driving signals to one end of the corresponding three paths of the LED lamps 13 by a level combination state of one of the three paths of the first level driving signals, specifically, the first level driving signal output by the GPIO 3.

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

The multi-channel gate driver 1212 is provided with three signal input ends, namely a1, a2 and A3, the multi-channel gate driver 1212 is provided with three enable signal ends, namely OE1, OE2 and OE3, the multi-channel gate driver 1212 is provided with three signal output ends, namely Y1, Y2 and Y3, a1, OE1 and Y1 correspond to each other, a2, OE2 and Y2 correspond to each other, and A3, OE3 and Y3 correspond to each other.

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

The three-way signal input terminals a1, a2, and A3 are configured to receive one of the first level driving signals in the three ways of first level driving signals, specifically, the first level driving signal output by the GPIO3, and the three-way signal output terminals Y1, Y2, and Y3 are configured to output three ways of the third level driving signals to the anode of the corresponding three ways of LED lamps 13, where Y1 is output to the LED3, Y2 is output to the LED1, and Y3 is output to the LED 2.

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 by the first level shifter 1211, received by the three-way enable signal terminals OE1, OE2, OE 3.

The input end of the first logic circuit 1221 is connected to the GPIO1 and the 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 the GPIO2 in the three paths of first level driving signals, and the second level shifter 1223 outputs one path of fourth level driving signal to a cathode of the corresponding path of LED lamp 13, specifically to a 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 the three paths of first level driving signals, and converts and outputs two paths of fourth level driving signals to the cathodes of the two corresponding paths of LED lamps 13, specifically the cathodes of LED2 and LED 3.

Taking fig. 5 as an example, table 2 shows the driving method of the LED driving circuit provided in this embodiment, where 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	LED1	LED2	LED3
						1	1	Without limitation	Extinguishment of	Extinguishment of	Extinguishment of
0	0	1	Extinguishment of	Lighting up	Lighting up
						0	0	0/1	Extinguishment of	Flashing	Flashing
0(1)	1(0)	1	Lighting up	Extinguishment of	Extinguishment of
						0(1)	1(0)	0/1	Flashing	Extinguishment of	Extinguishment of

TABLE 2

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

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

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

The LED driving circuit provided in this embodiment drives the three-way LED lamp 13 through a control circuit 11 having three output terminals.

EXAMPLE III

Referring to fig. 6, the present embodiment provides another LED driving circuit, which is different from embodiment 1 in that the control circuit 11 has three output terminals, which are GPIO1, GPIO2 and GPIO3, respectively, so that the control circuit 11 can output three paths of first level driving signals.

The gating output circuit 121 gates four paths of the third level driving signals to one end of the corresponding four paths of the LED lamps 13 by receiving one path of the first level driving signal in the three paths of the first level driving signals, specifically, by using a level combination state of the first level driving signal output by the GPIO 3.

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

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

The 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 the 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 by the first level shifter 1211, which is received by the four enable signal terminals OE1, OE2, OE3 and OE 4.

Taking fig. 6 as an example, table 3 shows the driving method of the LED driving circuit provided in this embodiment, where 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

LED1

LED2

LED3

LED4

1

Without limitation

Extinguishment of

0

1

Extinguishment of

Lighting up

0

0/1

Extinguishment of

Flashing

0(1)

1(0)

1

Lighting up

Extinguishment of

0(1)

1(0)

0/1

Flashing

Extinguishment of

TABLE 3

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

When the GPIO1 outputs a low level, the GPIOs 2 and 3 output a high level, or the GPIOs 1 and 3 output a high level, and the GPIO2 outputs a low level, the OE1 to OE4 all receive a low level, the Y1 to Y4 are turned on and output a high level to the anodes of the LED1, the LED2, the LED3 and the LED4, the first logic circuit 1221 outputs a high level to the second level shifter 1223, the second level shifter 1223 outputs a low level to the cathodes of the LED1 and the LED2, the LED1 and the LED2 are turned on, the second logic circuit 1222 outputs a high level to the cathodes of the LED3 and the LED4, the LED3 and the LED4 are turned off, and further, if the GPIO3 outputs a low level and a high level alternately, the LED1 and the LED2 flash square waves.

When GPIO1 and GPIO2 output a low level and GPIO3 outputs a high level, OE1 to OE4 all receive a low level, Y1 to Y4 are turned on and output a high level to the anodes of LED1, LED2, LED3 and LED4, first logic circuit 1221 outputs a low level to second level shifter 1223, second level shifter 1223 outputs a high level to the cathodes of LED1 and LED2, LED1 and LED2 are turned off, second logic circuit 1222 outputs a low level to the cathodes of LED3 and LED4, LED3 and LED4 are turned on, and further if GPIO3 outputs a square wave, that is, alternately outputs a low level and a high level, LED3 and LED4 blink.

The LED driving circuit provided in this embodiment drives the four-way LED lamp 13 through a control circuit 11 having three output terminals.

Example four

As shown in fig. 7, a 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 a specific structure of the LED driving circuit refers to the above embodiments. The LED driving circuit is correspondingly connected with the 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 the LED drive circuit of the same kind, simplified the structure of LED subassembly and reduced the design cost, wherein, the LED subassembly can be light, backlight, display screen isotructure, and concrete structure is not limited.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. An LED driving circuit, comprising:

2. The LED driving circuit according to claim 1, wherein the m second level driving signals include x third level driving signals and n fourth level driving signals, the x third level driving signals and the n fourth level driving signals respectively corresponding to one end of the x LED lamps, the third level driving signals are high or low, the fourth level driving signals are high or low, and x is less than or equal to n.

3. The LED drive circuit according to claim 2, wherein the drive circuit comprises:

4. The LED driving circuit according to claim 3, wherein the gate output circuit comprises a first level shifter and a multi-channel gate driver, the multi-channel gate driver comprising a multi-channel signal input terminal, a multi-channel enable signal terminal, and a multi-channel signal output terminal, the signal input terminal, the enable signal terminal, and the signal output terminal corresponding one to one;

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

5. The LED driver circuit of claim 4, wherein the first level shifter comprises at least one first NOT gate.

6. The LED drive circuit according to claim 3, wherein the logic output circuit comprises a first logic circuit, a second logic circuit, and a second level shifter;

7. The LED driver circuit of claim 6, wherein the first logic circuit comprises at least one exclusive-OR gate connected in correspondence with the control circuit.

8. The LED driver circuit of claim 6, wherein the second logic circuit comprises at least one OR gate connected in correspondence with the control circuit.

9. The LED driver circuit of claim 6, wherein the second level shifter comprises at least one second NOT gate connected in correspondence with the first logic circuit.

10. An LED assembly, comprising a plurality of LED lamps and the LED driving circuit according to any one of claims 1 to 9, wherein the LED driving circuit is correspondingly connected with the plurality of LED lamps.