CN213583061U

CN213583061U - Digital LED control circuit with address and capable of being connected in series and parallel at will

Info

Publication number: CN213583061U
Application number: CN202023024617.7U
Authority: CN
Inventors: 尹华平
Original assignee: Dongguan Huacaiwei Technology Co ltd
Current assignee: Dongguan Huacaiwei Technology Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-06-29
Anticipated expiration: 2030-12-15

Abstract

The utility model discloses a but take address connection in series-parallel digital LED control circuit wantonly, it includes control module and a plurality of LED luminescence chip, control module include: positive and negative electrodes and a voltage stabilizing protection circuit; the control module also comprises a chip address setting circuit connected with the serial decoding circuit, and an address code signal is input to the chip address setting circuit through the signal end. The address setting circuit in each control module can send address code data burning addresses on line, and complex and tedious burning operation is not needed. After the address code is successfully burned, the signal end inputs corresponding control data again, and the PWM signal is generated after internal decoding to control each LED chip.

Description

Digital LED control circuit with address and capable of being connected in series and parallel at will

Technical Field

The utility model relates to a LED control technology field, speciality take the arbitrary series-parallel connection digital LED control circuit of address.

Background

The current colorful LED products generally adopt a power supply carrier communication control technology. The LED module is internally provided with a carrier power supply circuit, carrier signals pass through an overvoltage comparator and a reference voltage circuit and then are separated to obtain carrier data, and the carrier data control the display colors of the LED modules corresponding to different pixel points.

The LED control circuit employed in the prior art includes: the circuit comprises a voltage comparator, a carrier data circuit, a reference voltage circuit, a reference frequency generating circuit, a logic control circuit, a PWM control and output driving circuit, a chip address setting circuit, a constant current source, a switch tube Q1, a switch tube Q2 and a switch tube Q3. When the switch tube is switched on, the LED is in a conducting state, when the switch tube receives signals with different duty ratios, the LED has different gray scales, and meanwhile, the current in the whole circuit can change along with the change of the gray scales. In the LED control circuit, the control circuit corresponding to each chip must have an address, the address burning of the chip needs to be externally connected with a probe for burning, one original material is generated when one address is burnt, and the production control difficulty is extremely high. Meanwhile, the power supply and the signal are grounded, so that the technology can only realize parallel application, and the voltage applied by the product is low, when a plurality of LED products consisting of the control circuit are connected in parallel, the voltage drop generated on the circuit is large, and the long-distance transmission is not facilitated. And because the LED can produce the current variation on the carrier bus when switching on and off, the ripple that produces on the circuit can direct interference carrier signal, is unfavorable for carrier signal's transmission, influences product stability.

To the above problem, the utility model discloses the people provides following technical scheme.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that just lies in overcoming the not enough of prior art existence, provide a but take the arbitrary series-parallel connection digital LED control circuit of address.

In order to solve the technical problem, the utility model adopts the following technical scheme: a digital LED control circuit with an address capable of being randomly connected in series and in parallel comprises: control module and a plurality of LED luminescence chip, control module include: the positive and negative electrodes are connected with an external power supply, and the voltage stabilizing protection circuit is positioned between the positive electrode and the negative electrode; the LED light-emitting device comprises a signal end, a data isolation extraction circuit, a reference voltage source circuit, a serial decoding circuit, a logic control circuit, a reference frequency generation circuit, a PWM control and output drive circuit, a switching tube and a switching tube, wherein the signal end is used for transmitting an external serial communication control signal, the data isolation extraction circuit is connected with the signal end, the reference voltage source circuit, the serial decoding circuit, the logic control circuit, the reference frequency generation circuit, the PWM control and output drive circuit, the switching tube is used for controlling an LED light-emitting chip, the switching tube is used for controlling the LED light-emitting chip, the LED light-emitting chip and the corresponding switching tube are connected in parallel, namely the anode of the; the source electrode of the switching tube is connected with the anode of a power supply, the drain electrode of the switching tube is connected with a constant current source, the grid electrode of the switching tube is connected with the PWM control and output driving circuit, and the conduction time of the switching tube is controlled by receiving the PWM duty ratio of the PWM control and output driving circuit to control the conduction and gray scale value of the LED light-emitting chip; the control module also comprises a chip address setting circuit connected with the serial decoding circuit, and the chip address setting circuit inputs an address code signal to the chip address through the signal end.

Further, in the above technical solution, the LED light emitting chips are three LED light emitting chips of any color, and each LED light emitting chip is correspondingly connected in parallel with one switching tube.

Further, in the above technical solution, the control module and the three LED light emitting chips are integrated in one module to form a complete LED lamp module, and the positive and negative electrodes and the signal terminal are used as three pins of the LED lamp module.

Further, in the above technical solution, the plurality of LED lamp modules are connected to a light emitting circuit, and signal terminals of all the LED lamp modules are connected in parallel.

Further, in the above technical solution, the plurality of LED lamp modules are connected to a light emitting circuit, and the positive and negative electrodes of all the LED lamp modules are connected in series.

Further, in the above technical solution, the plurality of LED lamp modules are connected to a light emitting circuit, and positive and negative electrodes of all the LED lamp modules are connected in parallel.

Further, in the above technical solution, the plurality of LED lamp modules are connected to a light emitting circuit, and positive and negative electrodes of all the LED lamp modules are connected to the light emitting circuit in a serial-parallel combination manner.

The utility model adopts the above technical scheme after, switch tube Q1, Q2, Q3 accept grey scale data processing circuit output's signal control self to switch on, the on-time through PWM's duty cycle control switch tube. When the switch tube is switched on, the corresponding LED light-emitting chip is switched off, and all current flows into the constant current source through the switch tube. When the duty ratio of the switching tube is 50%, the switching tube and the corresponding LED light-emitting chip respectively flow through half of the limited current of the constant current source. Therefore, the gray scale data of the corresponding LED light-emitting chip can be changed by changing the duty ratio of the PWM, and the total current flowing in the whole channel cannot be changed. Like this, no matter what kind of grey data is the LED luminescence chip in the circuit, because there is parallel relation between circuit switch tube and the LED luminescence chip that corresponds, can guarantee that the electric current of whole LED lamp module keeps invariable, keep series circuit electric current continuous stable when a plurality of LED lamp modules are established ties, each LED lamp module partial pressure is even, voltage stabilization protection circuit can prevent LED lamp module voltage too high and the even overvoltage protection of partial pressure portion in the circuit simultaneously, special circuit structure can establish ties or connect the pixel that multiunit this circuit constitutes in parallel, according to the quantity of establishing ties this circuit, supply voltage can accomplish higher.

In addition, the address setting circuit in each control module can send address code data burning addresses on line, and complex and tedious burning operation is not needed. After the address code is successfully burned, the signal end inputs corresponding control data again, and the PWM signal is generated after internal decoding to control each LED chip. Meanwhile, the direct-current isolation circuit of the input port of the circuit effectively ensures that the logic signals which are not grounded have good identification capability. Thereby further improving the stability of the product.

Drawings

FIG. 1 is a schematic diagram of an LED control circuit of the present invention;

FIG. 2 is a schematic diagram of an LED lamp module according to the present invention;

fig. 3 is a circuit diagram of the LED lamp module of the present invention applied to a multi-path series mode;

fig. 4 is a circuit diagram of the LED lamp module according to the present invention applied to a multi-path parallel mode;

fig. 5 is a circuit diagram of the LED lamp module according to the present invention applied to a multi-parallel multi-string mode;

fig. 6 is the circuit diagram of the utility model discloses well LED lamp module is applied to three cluster 12V supply voltage.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. The utility model relates to a but take arbitrary series-parallel connection digital LED control circuit of address, this LED control circuit passes through serial communication signal and realizes the control to the luminous chip of LED to realize the change of the luminous chip colour luminance of LED.

As shown in fig. 1, the utility model comprises: the control module 1 includes a plurality of LED light emitting chips (i.e., LED1, LED2, LED3 in fig. 1). The control module 1 comprises: positive and negative electrodes (VCC terminal, GND terminal shown in fig. 1) connected to an external power supply, and a voltage stabilization protection circuit 11 located between the positive and negative electrodes; a signal terminal (DAT terminal described in fig. 1) for transmitting an external serial communication control signal externally, a data isolation extraction circuit 12 connected to the signal terminal, and a reference voltage source circuit 13, a serial decoding circuit 14, a logic control circuit 15, a reference frequency generation circuit 16, a chip address setting circuit 17, a PWM control and output drive circuit 18, and switching tubes Q1, Q2, Q3 for controlling the LED light emitting chips.

The LED light-emitting chips are connected with the corresponding switch tubes in parallel, namely the anodes of the LED1, the LED2 and the LED3 in the figure 1 are connected with the anode VCC of the power supply, and meanwhile, the LED1, the LED2 and the LED3 are respectively connected with one corresponding switch tube Q1, Q2 and Q3 in parallel. Specifically, the anodes of the

LEDs

1, 2 and 3 are connected to the positive electrode VCC of the power supply, and the cathodes of the

LEDs

1, 2 and 3 are connected to the drains of the corresponding switching tubes Q1, Q2 and Q3; the sources of the switching tubes Q1, Q2 and Q3 are connected to the positive electrode VCC of the power supply, and the drains of the switching tubes Q1, Q2 and Q3 are also connected to a constant current source, which can control the current flowing through each LED. The gates of the switching tubes Q1, Q2 and Q3 are connected to the PWM control and output driving circuit 18, and the on time of the switching tubes is controlled by the duty ratio of the PWM received by the PWM control and output driving circuit 18, thereby controlling the on and gray scale values of the LED light emitting chip itself. For example, when the switching tube is turned on, the LED light-emitting chip is turned off, all current flows into the constant current source through the switching tube, when the duty ratio of the switching tube is 50%, the switching tube and the LED respectively flow half of the limited current of the constant current source, the gray scale data of the LED light-emitting chip can be changed by changing the PWM duty ratio, and the total current flowing in the whole channel is not changed. The three switch tubes respectively control the three LED light-emitting chips. The circuit works in the same way, so that the current in the circuit is constant no matter what gray data the led light emitting chip is in.

The voltage stabilizing protection circuit 11 between the positive electrode and the negative electrode can prevent the over-voltage and the uniform overvoltage protection of the voltage division part.

In the actual implementation process, the control module 1 is a control chip, and since the control module 1 includes a chip address setting circuit 17 connected to the serial decoding circuit 14, the address code signal is input to the chip address setting circuit 17 through the signal terminal DAT. The utility model discloses give control module 1 before normal work earlier and send the address burning code, the inside data of control module 1 keeps apart and draws circuit 12 and serial decoding circuit 14 and decodes the address code and then spread into chip address setting circuit 17 into, and chip address setting circuit 17 accessible fusing corresponding fuse burns the address into in control module 1.

See fig. 2, this is a schematic diagram of the LED lamp module 2 according to the present invention, which integrates the control module 1 and the

LEDs

1, 2, and 3 of RGB three colors into one module to form an LED lamp module 2 (i.e. a lamp bead in a light emitting circuit). The LED lamp module 2 can be used as a controllable pixel point and applied to products such as an LED display panel and the like. This LED lamp module 2 corresponds with control module 1, and control module 1's positive negative pole and signal end are as this LED lamp module 2's three pin: the power supply circuit comprises a power supply circuit anode pin VCC, a power supply circuit cathode pin GND and a signal input pin DAT. The whole LED lamp module 2 is simple in structure and convenient for subsequent series-parallel connection.

As shown in fig. 3, the LED lamp module 2 of the present invention is applied to a light emitting circuit 3, and the LED lamp module 2 in the light emitting circuit 3 adopts a multi-path series mode. In this embodiment, a plurality of LED lamp modules 2 are directly connected in series, and then connected to the power supply circuit, and controlled by the controller 30. Specifically, when the plurality of LED lamp modules 2 are connected to the light emitting circuit 3, the signal terminals of all the LED lamp modules 2 are connected in parallel, and the positive and negative electrodes of the LED lamp modules 2 are connected in series.

As shown in fig. 4, this is a circuit diagram for applying the LED lamp module 2 to a multiple parallel mode. The LED lamp modules 2 are directly connected in parallel, and then connected to the power supply circuit 3 and controlled by the controller 30. Namely, the signal terminals of all the LED lamp modules 2 are connected in parallel, and the positive and negative electrodes of the LED lamp modules 2 are connected in parallel.

In addition, the LED lamp module can also be applied to a multi-parallel multi-string connection mode, as shown in fig. 5.

When the utility model discloses in inserting lighting circuit 3, the during operation, the data of controller 30 among the lighting circuit 3 are input to data isolation extraction circuit 12 through signal input terminal pin DAT, and the data that will need after the isolation are extracted and are input to serial decoding circuit 14, control after decoding the utility model discloses a LED luminescence chip switch and luminance. Since the data of the controller 30 and the data input of all the LED lamp modules 2 are connected in parallel, the damage of any one LED lamp module 2 does not affect the data use of other LED lamp modules 2.

In addition, as shown in fig. 1, because the switching tube and the corresponding LED light emitting chip are connected in parallel, the current flowing through the circuit can be kept constant, and no ripple is generated on the circuit due to the constant current. And meanwhile, a plurality of groups of pixel points formed by the circuits can be connected in series or in parallel. The supply voltage can be made higher depending on the number of circuits connected in series. Meanwhile, the voltage stabilizing protection circuit 11 in the circuit can prevent the damage of other parts in the circuit from affecting the damage of the whole product.

Fig. 6 shows a circuit diagram of a light emitting circuit in which the LED lamp module 2 of the present invention is applied to three strings of 12V power supply voltages. Assuming that the signal output from the signal terminal DAT of the controller 30 is a TTL waveform with a signal amplitude of 5V, the GND of the LED lamp module 2-1 is grounded to the GND terminal of the controller 30, the data received by the LED lamp module 2-1 is a TTL waveform with 5V, and since three LED lamp modules are connected in series with a voltage of 12V, each LED lamp module can be divided into 4V on average, in other words, the VCC terminal of the LED lamp module 2-1 is 4V with respect to the GND voltage of the controller 30, the VCC terminal of the LED lamp module 2-2 is 8V with respect to the GND voltage of the controller, the VCC terminal of the LED lamp module 2-3 is 12V with respect to the GND voltage of the controller 30, and the VCC terminal of each LED lamp module is 4V with respect to the respective GND voltage. The LED lamp module 2-1 receives a TTL waveform with a controller signal of 5V, the LED lamp module 2-2 receives carrier data with a controller signal of 4V and a controller signal of 8V, and the LED lamp module 2-3 receives carrier data with a controller signal of 30 and a signal of 8V. The direct current isolation circuit of the input port effectively ensures that logic signals which are not in common with the ground have good identification capability no matter how the external power supply voltage changes.

Simultaneously because the utility model discloses a still there is a set of steady voltage protection circuit between the power supply positive pole among the LED lamp module circuit and the power supply negative pole. The voltage stabilizing protection circuit can prevent the voltage from being overhigh and the voltage division part from being uniform. Thereby effectively ensuring the normal work of the whole system in any series-parallel structure. As shown in fig. 6, when other functional circuits of one LED lamp module are damaged, the voltage stabilizing protection circuit is turned on, and the voltage between the damaged LED lamp module VCC and GND is stabilized at 4V, so as to prevent the voltage between VCC and GND of the remaining two LED lamp modules from being damaged due to too large voltage.

Of course, the above description is only an exemplary embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes and modifications made by the constructions, features, and principles of the present invention in accordance with the claims of the present invention are intended to be included in the scope of the present invention.

Claims

1. A digital LED control circuit with an address capable of being randomly connected in series and in parallel comprises: control module and a plurality of LED luminescence chip, control module include: the positive and negative electrodes are connected with an external power supply, and the voltage stabilizing protection circuit is positioned between the positive electrode and the negative electrode; with the signal end that outside is used for transmitting outside serial communication control signal, with the data isolation extraction circuit of signal end connection to and reference voltage source circuit, serial decoding circuit, logic control circuit, reference frequency generating circuit, PWM control and output drive circuit and control LED luminescence chip's switch tube, its characterized in that:

the LED light-emitting chips are connected with the corresponding switch tubes in parallel, namely the anodes of the LED light-emitting chips are connected with the source electrodes of the switch tubes, and the cathodes of the LED light-emitting chips are connected with the drain electrodes of the switch tubes; the source electrode of the switching tube is connected with the anode of a power supply, the drain electrode of the switching tube is connected with a constant current source, the grid electrode of the switching tube is connected with the PWM control and output driving circuit, and the conduction time of the switching tube is controlled by receiving the PWM duty ratio of the PWM control and output driving circuit to control the conduction and gray scale value of the LED light-emitting chip;

the control module also comprises a chip address setting circuit connected with the serial decoding circuit, and the chip address setting circuit inputs an address code signal to the chip address through the signal end.

2. The addressable arbitrary series-parallel digital LED control circuit of claim 1, wherein: the LED light-emitting chips are of three LED light-emitting chips with any color, and each LED light-emitting chip is correspondingly connected with one switch tube in parallel.

3. The addressable arbitrary series-parallel digital LED control circuit of claim 2, wherein: the control module and the three LED light-emitting chips are integrated in one module to form a complete LED lamp module, and the positive and negative electrodes and the signal end are used as three pins of the LED lamp module.

4. The addressable arbitrary series-parallel digital LED control circuit of claim 3, wherein: the LED lamp modules are connected into a light-emitting circuit, and the signal ends of all the LED lamp modules are connected in parallel.

5. The addressable arbitrary series-parallel digital LED control circuit of claim 4, wherein: the LED lamp modules are connected into a light-emitting circuit, and positive and negative electrodes of all the LED lamp modules are connected in series.

6. The addressable arbitrary series-parallel digital LED control circuit of claim 4, wherein: the LED lamp modules are connected into a light-emitting circuit, and positive and negative electrodes of all the LED lamp modules are connected in parallel.

7. The addressable arbitrary series-parallel digital LED control circuit of claim 4, wherein: the LED lamp modules are connected into a light-emitting circuit, and positive and negative electrodes of all the LED lamp modules are connected into the light-emitting circuit in a series-parallel combination mode.