CN206472342U

CN206472342U - The drive circuit of independent LED controls

Info

Publication number: CN206472342U
Application number: CN201720052734.3U
Authority: CN
Inventors: 唐瑞; 于娟
Original assignee: Panzhihua University
Current assignee: Panzhihua University
Priority date: 2017-01-16
Filing date: 2017-01-16
Publication date: 2017-09-05
Anticipated expiration: 2027-01-16

Abstract

The utility model is related to the drive circuit of independent LED controls, including at least two driving chips and processor with 8 output, by the corresponding I/O ports of access processor after 8 output ends parallel connection of each driving chip, the enable control port of each driving chip connects corresponding I/O ports on processor respectively.The drive circuit of independent LED controls of the present utility model; it can be good at driving independent LED display; and independent LED optimal brightness can be reached; realize the Dynamic Announce of independent LED dot matrix electronic display; and circuit structure is simple; cost is low, easy to maintain, also with protection circuit, further ensures the reliability of drive circuit.

Description

The drive circuit of independent LED controls

Technical field

The utility model is related to drive circuit, is concretely the drive circuit of independent LED controls.

Background technology

With popularization of the LED display in advertisement field, its control system is also such as emerged rapidly in large numbersBamboo shoots after a spring rain, emerged in an endless stream.At present The control system of LED display curtain is all based on embedded microprocessor exploitation, therefore is typically by single-chip microcomputer in control system It is controlled as processor.But be due to LED display control it is more complicated, wherein the design of independent LED drive circuit It is mostly important, the content for seeing display clearly is otherwise just difficult under strong light.Numeral typically is passed through to the rank scanning of LED screen at present Chip, such as 74LS595 chips, and the need for the driving force of digit chip does not reach independent LED normal brightness far, therefore need Want external other drive circuits or use large driven current density, can be only achieved each independent LED normal brightness, and work as voltage When unstable, driving chip and LED are often burnt out, is caused damage.

Utility model content

The utility model provides a kind of drive circuit of independent LED controls, and directly independent LED ranks are swept with realizing Retouch, and each independent LED is attained by normal brightness.

The drive circuit of independent LED control of the present utility model, including at least two have 8 output driving chips and Processor, by the corresponding I/O ports of access processor, the enable of each driving chip after 8 output ends parallel connection of each driving chip Control port connects corresponding I/O ports on processor respectively.

In LED display during display, its principle is to light each independent LED for needing to light by setting.LED points The least unit of battle array is 8 × 8, the row arrangement of as 8 rows 8, therefore the utility model uses the driving chip with 8 output, energy Enough driving currents are enough provided.For each 8 × 8 lattice module, 1 driving chip drives 8 rows, another driving Chip drives 8 are arranged.After processor sends displays content data order, driving chip is scanned, and each be somebody's turn to do is lighted with this Bright independent LED.According to LED display simultaneously display content number come determine need how many driving chips.When driving core When the enable control port of piece is high level, latch data is that output is synchronous, when the enable control port of driving chip is low During level, meet setup time (the independent LED that i.e. needs are lighted) and retention time (needs holding after i.e. independent LED is lighted Time) data can be latched, the scanning of 8 rows 8 row also can be just smoothed out, and pass through the enable control to driving chip System can also improve the hysteresis of immunity to interference when independent LED is shown, it is not in shake, flicker, ghost image etc. to make independent LED Phenomenon.

Further, processor is also associated with pull-up resistor corresponding with output end, for electric signal clamper is electric in height It is flat, enough electric currents are provided for independent LED.

It is preferred that, the backward dioded by series connection can also be connected between the power input of processor and ground connection The protection circuit of composition.By the reverse-conducting of diode, the effect to processor voltage stabilizing is reached, when the input voltage of processor When excessive, shunted by the diode in breakdown protection circuit, decline voltage, so as to protect processor.

Further, described driving chip includes being used for the row driving chip of independent LED array scanning and for only The line driving chip of vertical LED rows scanning, wherein access processor is corresponding 8 after 8 output ends of each row driving chip are in parallel I/O ports, the corresponding other 8 I/O ports of access processor after 8 output ends of each line driving chip are in parallel, therefore processing Device, which only needs to 16 I/O ports, can complete the control to all independent LED, greatly simplify the complexity of circuit.

Optionally, described processor is single-chip microcomputer, or other have the processing unit of similar functions.

It is preferred that, described driving chip is 74HC573 type driving chips.

The drive circuit of independent LED controls of the present utility model, can be good at driving independent LED display, and energy Independent LED optimal brightness is enough reached, the Dynamic Announce of independent LED dot matrix electronic display, and circuit structure letter is realized Single, cost is low, easy to maintain, also with protection circuit, further ensures the reliability of drive circuit.

Embodiment with reference to embodiments, remakes further specifically to the above of the present utility model It is bright.But the scope that this should not be interpreted as to the above-mentioned theme of the utility model is only limitted to following example.It is new not departing from this practicality In the case of the above-mentioned technological thought of type, the various replacements or change made according to ordinary skill knowledge and customary means, It should be included in the range of the utility model.

Brief description of the drawings

Fig. 1 is the circuit diagram for the drive circuit that the utility model independence LED is controlled.

Embodiment

The drive circuit of independent LED control of the present utility model as shown in Figure 1, including 2 to independent LED in LED screen The 74HC573 types driving chip of line scan and 8 74HC573 types to independent LED array line scanning in LED screen drive core Piece, and 51 single chip computer architectures processor CPU.8 output ends of the 74HC573 type driving chips for being respectively used for column scan The corresponding 8 I/O ports of access processor CPU, the 8 of the 74HC573 type driving chips respectively scanned for row after 1Q~8Q is in parallel The corresponding other 8 I/O ports of access processor after position output end 1Q~8Q is in parallel.Pass through 51 processor of single chip computer CPU P2 Port and P3 ports connect the enable control port CLK of each driving chip respectively, and the content so shown just can be successively. When the enable control port CLK of driving chip is high level, latch data is that output is synchronous, when the enable control of driving chip When port CLK processed is low level, meeting setup time (the independent LED that i.e. needs are lighted) and retention time, (i.e. independent LED is lighted Need afterwards keep time) data can be latched, 8 rows 8 row scanning also can just be smoothed out, and by driving The enable control of chip can also improve the hysteresis of immunity to interference when independent LED is shown, it is not in tremble to make independent LED The phenomenons such as dynamic, flicker, ghost image.

Processor is also associated with pull-up resistor R0~R7 corresponding with output end, for by electric signal clamper in high level, Enough electric currents are provided for independent LED.Meanwhile, it is also associated between the power input of processor and ground connection by series connection Backward dioded D1, the protection circuit that D2 is constituted, to stablize the input voltage of processor, protection processor will not be rushed by high pressure Hit.

Claims

1. the drive circuit of independent LED controls, it is characterized in that：There are 8 driving chips exported and processing including at least two Device, by the corresponding I/O ports of access processor after 8 output ends parallel connection of each driving chip, the enable control of each driving chip Port connects corresponding I/O ports on processor respectively.

2. the drive circuit of independent LED controls as claimed in claim 1, it is characterized in that：Processor is also associated with and output end Corresponding pull-up resistor (R0~R7).

3. the drive circuit of independent LED controls as claimed in claim 1, it is characterized in that：Processor power input and The protection circuit being made up of the backward dioded (D1, D2) of series connection is connected between ground connection.

4. the drive circuit of the independent LED controls as described in one of claims 1 to 3, it is characterized in that：Described driving chip bag The row driving chip for being scanned to independent LED array and the line driving chip for being scanned to independent LED rows are included, wherein each row drive The corresponding 8 I/O ports of access processor, 8 output end parallel connections of each line driving chip after 8 output ends of dynamic chip are in parallel The corresponding other 8 I/O ports of processor are accessed afterwards.

5. the drive circuit of the independent LED controls as described in one of claims 1 to 3, it is characterized in that：Described processor is single Piece machine.

6. the drive circuit of the independent LED controls as described in one of claims 1 to 3, it is characterized in that：Described driving chip is 74HC573 type driving chips.