CN209930553U

CN209930553U - Decoder of four channels

Info

Publication number: CN209930553U
Application number: CN201822152416.1U
Authority: CN
Inventors: 李久芳; 郑佳鑫; 邓先得; 刘权才
Original assignee: Chongqing Lvdu Technology Industry Co Ltd
Current assignee: Chongqing Lvdu Technology Industry Co Ltd
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2020-01-10
Anticipated expiration: 2028-12-21

Abstract

The utility model discloses a four-channel decoder, which comprises a protection circuit, a signal level conversion circuit, a control circuit and a drive circuit which are connected in sequence, wherein the input end of the protection circuit is used for receiving DMX512 dimming signals, and the drive circuit is used for connecting LED lamps to be driven; the control circuit is connected with the dial switch setting circuit and the power supply circuit which is respectively used for supplying power to the control circuit and the driving circuit. The utility model discloses a dial switch sets for the circuit and can change the address code, provides manifold dimming effect.

Description

Decoder of four channels

Technical Field

The utility model belongs to the technical field of the technique of adjusting luminance and specifically relates to a decoder of four-channel.

Background

In the international standard stage lighting control protocol, the DMX512 signal is a standard signal system input as a dimming signal, and is widely used. The control center can remotely control the LED lamp of each address to change with different brightness or color through the DMX512 signal, because at the product end, the decoder can not change the corresponding address of the LED lamp, if the dimming mode needs to be changed, the DMX512 dimming signal needs to be changed by the control end. Therefore, it is necessary to provide a decoder capable of changing the address code.

SUMMERY OF THE UTILITY MODEL

The utility model provides a decoder of four-channel sets for the circuit through dial switch and can change the address code, provides manifold dimming effect.

A four-channel decoder comprises a protection circuit, a signal level conversion circuit, a control circuit and a driving circuit which are sequentially connected, wherein the input end of the protection circuit is used for receiving a DMX512 dimming signal, and the driving circuit is used for connecting an LED lamp to be driven; the control circuit is connected with the dial switch setting circuit and the power supply circuit which is respectively used for supplying power to the control circuit and the driving circuit.

Preferably, the control circuit comprises a chip N76E003AT 20.

Preferably, the dial switch setting circuit comprises a dial switch SW-DIP-10, pins 12 to 20 of the dial switch are all grounded, and pins 1 to 9 of the dial switch are respectively connected with

pins

1, 2, 20, 19, 18, 17, 10, 12 and 11 of the chip N76E003AT 20.

Preferably, the signal level conversion circuit comprises a chip SN75176, a pin 6 and a pin 7 of the chip SN75176 are connected with the output end of the protection circuit, and a pin 1 of the chip SN75176 is connected with a pin 3 of a chip N76E003AT 20.

Preferably, the protection circuit comprises a first fuse, a second fuse, a resistor R10, a first voltage regulator tube and a second voltage regulator tube, wherein the first input end, the first fuse and the first output end are sequentially connected, the second input end, the second fuse and the second output end are sequentially connected, two ends of the resistor R10 are respectively connected with the first output end and the second output end, the first voltage regulator tube and the grounding end are sequentially connected, and the second output end, the second voltage regulator tube and the grounding end are sequentially connected.

Preferably, four driving circuits are provided, each of the four driving circuits comprises an MOS transistor, a first resistor, a second resistor and a control end, the first resistor and the grounding end are sequentially connected, the control end, the second resistor and the gate of the MOS transistor are sequentially connected, the source of the MOS transistor is grounded, and the drain of the MOS transistor is used for connecting the LED lamp; the control terminals of the four driving circuits are respectively connected with pins 13-16 of the chip N76E003AT 20.

Preferably, the intelligent power supply further comprises a status indicating circuit connected with the control circuit, wherein the status indicating circuit comprises an indicating lamp and a resistor R5, and the pin 8 of the chip N76E003AT20, the resistor R5, the indicating lamp and the grounding sequence end are sequentially connected.

Preferably, the power circuit comprises a rectifying circuit, a filter circuit and a voltage stabilizing circuit.

The utility model discloses in, the accessible dial switch sets for the address code that the circuit set for the LED lamp, long-range DMX512 signal is through protection circuit processing back, transmit to signal level conversion circuit, signal level conversion circuit carries out level conversion to the signal, reentry to control circuit, control circuit withdraws from the self-test operational mode in case receiving DMX512 signal, and decode the luminance value of the corresponding passageway of this address according to the address that dial switch set for, export drive circuit through inside hardware PWM, drive circuit drives the LED lamp. Because the address code of the LED lamp can be set by the dial switch setting circuit, the dimming effect is more various.

Meanwhile, due to the adoption of the special differential signal lightning protection circuit, the product can be protected from being damaged by static electricity and lightning.

Drawings

Fig. 1 is a schematic structural diagram of a four-channel decoder according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a control circuit according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a dial switch setting circuit according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a signal level conversion circuit according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a protection circuit according to an embodiment of the present invention;

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

fig. 7 is a schematic structural diagram of a status indication circuit according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The embodiment of the utility model provides a four-channel decoder, as shown in fig. 1, it includes protection circuit 1, signal level converting circuit 2, control circuit 4 and drive circuit 5 that link to each other in order, the input of protection circuit 1 is used for receiving DMX512 dimming signal, drive circuit 5 is used for connecting the LED lamp of treating the drive; the system also comprises a dial switch setting circuit 3 connected with the control circuit 4 and a power supply circuit 6 respectively used for supplying power to the control circuit 4 and the driving circuit 5. The protection circuit 1 is used for carrying out circuit protection on an input end, the signal level conversion circuit 2 converts DMX512 dimming signals into level signals which can be identified by the control circuit 4, the dial switch setting circuit 3 can set addresses of LED lamps, the control circuit 4 compares the address codes set by the dial switch with the address codes set by the dial switch, four-channel PWM driving signals of the addresses are output through four internal PWM hardware, driving voltage is output to the LED lamps through the driving circuit 5, and dimming is achieved.

In one embodiment, as shown in FIG. 2, the control circuit includes a chip N76E003AT 20. The 4 pin and the 10 pin of the chip N76E003AT20 are connected with a direct current power supply in a conventional connection method.

Further, as shown in fig. 3, the setting circuit of the dial switch includes a dial switch SW-DIP-10, pins 12 to 20 of the dial switch are all grounded, and pins 1 to 9 of the dial switch are respectively connected to

pins

1, 2, 20, 19, 18, 17, 10, 12 and 11 of the chip N76E003AT 20. By switching the 10-bit toggle switch, the high and low levels of the 1-9 bits can set the addresses 0-511, and input into the chip N76E003AT 20. The 10 th switch,

pins

10 and 11, is the input to the DMX512 signal.

As shown in FIG. 4, the signal level conversion circuit comprises a chip SN75176, a pin 6 and a pin 7 of the chip SN75176 are connected with the output end of the protection circuit, and a pin 1 of the chip SN75176 is connected with a pin 3 of a chip N76E003AT 20. The DMX512 signal is a differential signal with strong anti-interference capability and is converted into a TTL signal which can be identified by a control circuit through a chip SN 75176.

As shown in fig. 5, the protection circuit includes a first fuse FB, a second fuse FA, a resistor R10, a first voltage regulator TVS1 and a second voltage regulator TVS2, wherein a first input Di-, the first fuse and a first output D-are sequentially connected, a second input Di +, the second fuse and a second output D + are sequentially connected, two ends of the resistor R10 are respectively connected to the first output and the second output, the first voltage regulator and a ground terminal are sequentially connected, and the second output, the second voltage regulator and the ground terminal are sequentially connected. The second output terminal is connected with the pin 6 of the chip SN75176, and the first output terminal is connected with the pin 7 of the chip SN 75176. The first input Di-and the second input Di + are inputs for the DMX512 signal. The fuse can play the effect of current-limiting, and the stabilivolt then can play the steady voltage effect, and long-range DMX512 signal of coming can respond to too high voltage, can prevent to damage inside components and parts after this circuit protection.

As shown in fig. 6, four driving circuits are provided, each of the four driving circuits includes a MOS transistor, a first resistor, a second resistor, and a control terminal, and as shown in the figure, the RC, GC, BC, and WC ports are all control terminals. The control terminals of the four driving circuits are respectively connected with pins 13-16 of the chip N76E003AT 20. The control end, the first resistor and the grounding end of each driving circuit are sequentially connected, the control end, the second resistor and the MOS tube grid are sequentially connected, the source electrode of the MOS tube is grounded, and the drain electrode of the MOS tube is used for connecting the LED lamp. The W, B, G and R interfaces are respectively connected with four LED lamps, one end of each LED lamp is connected with a power supply, and the other end of each LED lamp is connected with the W, B, G and R interfaces, so that the power supply, the LED lamps and the MOS tubes form a series circuit. Taking the MOS transistor on the left side in the figure as an example, the control terminal RC, the first resistor RR1 and the ground terminal are sequentially connected, the control terminal RC, the second resistor RR2 and the gate of the MOS transistor RQ1 are sequentially connected, the source of the MOS transistor RQ1 is grounded, and the drain of the MOS transistor RQ1, that is, the R port, is used for connecting the LED lamp. The control circuit controls the on-off of the switch tube by outputting the PWM dimming signal, so that the dimming of the LED lamp is realized.

In one embodiment, as shown in fig. 7, the electronic device further comprises a status indicating circuit 7 connected to the control circuit, wherein the status indicating circuit comprises an indicator light LEDR and a resistor R5, and the pin 8 of the chip N76E003AT20, the resistor R5, the indicator light and the ground terminal are sequentially connected. When the whole circuit works, the indicator light can be lightened to indicate the working state of the circuit.

In one embodiment, as shown in FIG. 7, the power circuit includes a rectifying circuit, a filtering circuit, and a voltage stabilizing circuit. The input 12-24V direct current voltage forms half-wave rectification through a diode D1, then enters a linear voltage stabilization chip U3 after being subjected to voltage division and current limitation through three resistors, and is filtered by output capacitors E2 and C1, so that stable and clean 5V voltage is provided for each circuit, and input voltage with enough power is provided for a driving circuit.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement.

Claims

1. A four-channel decoder, characterized by:

the LED dimming circuit comprises a protection circuit, a signal level conversion circuit, a control circuit and a driving circuit which are sequentially connected, wherein the input end of the protection circuit is used for receiving a DMX512 dimming signal, and the driving circuit is used for connecting an LED lamp to be driven; the control circuit is connected with the dial switch setting circuit and the power supply circuit which is respectively used for supplying power to the control circuit and the driving circuit.

2. The decoder according to claim 1, characterized in that:

the control circuit includes a chip N76E003AT 20.

3. The decoder according to claim 2, characterized in that:

the setting circuit of the dial switch comprises a dial switch SW-DIP-10, pins 12-20 of the dial switch are all grounded, and pins 1-9 of the dial switch are respectively connected with pins 1, 2, 20, 19, 18, 17, 10, 12 and 11 of a chip N76E003AT 20.

4. The decoder according to claim 2, characterized in that:

the signal level conversion circuit comprises a chip SN75176, pins 6 and 7 of the chip SN75176 are connected with the output end of the protection circuit, and pin 1 of the chip SN75176 is connected with pin 3 of the chip N76E003AT 20.

5. The decoder according to claim 4, characterized in that:

the protection circuit comprises a first fuse, a second fuse, a resistor R10, a first voltage-regulator tube and a second voltage-regulator tube, wherein a first input end, the first fuse and a first output end are sequentially connected, a second input end, the second fuse and a second output end are sequentially connected, two ends of a resistor R10 are respectively connected with the first output end and the second output end, the first voltage-regulator tube and a grounding end are sequentially connected, and the second output end, the second voltage-regulator tube and the grounding end are sequentially connected.

6. The decoder according to claim 2, characterized in that:

the four driving circuits comprise MOS tubes, first resistors, second resistors and control ends, the first resistors and the grounding ends are sequentially connected, the control ends, the second resistors and the MOS tube grids are sequentially connected, the source electrodes of the MOS tubes are grounded, and the drain electrodes of the MOS tubes are used for being connected with the LED lamps; the control terminals of the four driving circuits are respectively connected with pins 13-16 of the chip N76E003AT 20.

7. The decoder according to any of claims 2-6, characterized by:

the LED chip further comprises a state indicating circuit connected with the control circuit, wherein the state indicating circuit comprises an indicating lamp and a resistor R5, and the 8 pin of the chip N76E003AT20, the resistor R5, the indicating lamp and the grounding sequential end are sequentially connected.

8. The decoder according to any of claims 1-6, characterized by:

the power supply circuit comprises a rectifying circuit, a filter circuit and a voltage stabilizing circuit.