CN110933807A - 65536 Gray scale LED constant voltage 3-channel decoding control circuit - Google Patents

Abstract

The invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which comprises: the power supply terminal is connected with the power supply end of UCS8903 and one end of R-R, R-G, R-B and R1, the foot 5 of UCS8903 is connected with R-B1, the foot 3 of UCS8903 is connected with R-G1, the foot 1 of UCS8903 is connected with R-R1, and the other end of R-R, R-G, R-B is connected with optical couplers UR, UG and UB through DR, DG and DB respectively. The three optical couplers are respectively connected into the triodes DR, DG and DB through the resistors R-R-1, R-G-1 and R-B-1, and are connected into the corresponding load LED lamps through turning off the corresponding MOS tubes QR, QG and QB. The method has the advantages that the gray scale with higher level is provided for the decoder by changing the gray scale of the control chip to meet the requirement of the color gray scale of the computer display screen, and simultaneously, the method provides reliable guarantee for controlling the output of the high-power LED lamp, the breakpoint transmission and the direct feedback of the cut-off load by changing the circuit control mode.

Description

65536 Gray scale LED constant voltage 3-channel decoding control circuit

Technical Field

The invention belongs to the field of intelligent control of LED lamps, and relates to a driving decoding circuit for controlling LED lamp load in a high gray scale mode under specific conditions by an LED intelligent control system.

Background

FIG. 5 shows a conventional LED constant voltage 3-channel decoding control device circuit, as shown in FIG. 5, WS2811 has 256 gray levels; the control system device sends a control program to the WS2811 control module through a DAT port and a GND port; the WS2811 main control chip VDD/OUTR/UOTG/OUTB is a load output port and is connected with a load LED lamp non-interval circuit; Din/GND is a signal input end, Do/GND is a signal output end, 33R is a line current-limiting resistor, and 104 is a capacitor for discharging to a load; the lamp comprises 3 RGB lamp beads of a lamp, 3 lamp beads of R, G, B each color, 12V input voltage, RR and R1 which are connected with WS2811 in a control mode, wherein each load of the lamp does not exceed 1W, and the power is too low. If faults such as load short circuit, overvoltage, overcurrent and the like occur or static electricity is introduced, the master control chip WS2811 is easily burnt and electrically broken down. Once the main control chip is burnt or broken down, a break point can be formed on the main circuit, signals cannot be transmitted, and subsequent loads are not controlled by the main control system any more.

Disclosure of Invention

The invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit. The gray scale of the control chip is changed to provide higher gray scale for the decoder to meet the requirement of color gray scale of a computer display screen, and meanwhile, the circuit control mode is changed to provide reliable guarantee for controlling the output of the high-power LED lamp, the breakpoint transmission and the direct feedback of the cut-off load. As shown in fig. 1.

The invention provides 65536 gray scale LED constant voltage 3-channel decoding control equipment which comprises a direct current power supply DC wiring terminal, a current limiting resistor R13200 ohm, a power indicator lamp, a rectifier diode SS14, a capacitor C1104 UF, a resistor R11000 ohm, a capacitor C3014 UF and an 8903 IC chip U1, a capacitor C2104 UF, a resistor R068 ohm, a resistor Ri 68 ohm, a resistor R-R2200 ohm, a resistor R-B2200 ohm, a resistor R-G2200 ohm, switch diodes LL 41483 (DR, DG and DB), resistors R-R12000 ohm, a resistor R-G12000 ohm and a resistor R-B12000 ohm.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the optical couplers EL 8173 (UR, UG, UB), the resistance R2470 ohm, the resistance R-R310000 ohm, the resistance R-G310000 ohm, the resistance R-B310000 ohm, the resistance R-R210000 ohm, the resistance R-G210000 ohm and the resistance R-B210000 ohm.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the LED lamp comprises resistors R-R-11000 ohm, resistors R-G-11000 ohm, resistors R-B-11000 ohm, transistors J3Y 3 (QR, QG and QB), MOS transistors N306AD 3, voltage stabilizing diodes LL 4148D 0 and an output connecting terminal of the LED lamp.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the power supply terminal is connected with the power supply end of UCS8903 and one end of R-R, R-G, R-B and R1, the foot 5 of UCS8903 is connected with R-B1, the foot 3 of UCS8903 is connected with R-G1, the foot 1 of UCS8903 is connected with R-R1, and the other end of R-R, R-G, R-B is connected with optical couplers UR, UG and UB through DR, DG and DB respectively.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the three optical couplers are respectively connected into the triodes DR, DG and DB through the resistors R-R-1, R-G-1 and R-B-1, and are connected into the corresponding load LED lamps through turning off the corresponding MOS tubes QR, QG and QB.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the power indicator lights are on when the power DC12V input terminals.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when a power supply DC12V is input to a terminal, the power supply DC12V is rectified by a diode D1, filtered by a ceramic chip capacitor C1 and an electrolytic capacitor C3, and divided by a resistor R1 to obtain pure direct current voltage 5V, and the pure direct current voltage is input to a 2-pin VDD port of UCS8903, wherein the diode D1 prevents the anode and cathode of the input end power supply from being reversely connected, effectively protects the main control chip UCS8903, and a power supply indicating circuit is formed by the R1 and an LED to display whether the power supply 12VDC is correctly connected or not.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when the power supply DC12V inputs terminals, the UCS8903 chip displays a cascade data signal input terminal at pin 5 DOUT and a cascade data signal output terminal at pin 6 DIN. The controller signal or the previous stage cascade signal is input to the 5-pin DOUT of the UCS8903 through the signal matching and protection resistor RI, the residual data is reshaped and forwarded after the corresponding data is intercepted by the chip processor, and the residual data is transmitted to the next stage chip through the signal matching and protection resistor RO. The RI and RO resistors prevent damage to the IC input and output terminals under the conditions of live plugging or reverse connection of a power supply and a signal line.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when a power supply DC12V inputs a terminal, a 7-pin SET port of a chip controls the magnitude of OUTR, OUTG and OUTB driving currents, when the power supply DC12V is suspended, the RGB output port is 18mA, and when the power supply DC12V is connected with VDD is 32mA, the scheme is suspended, namely the currents of the OUTR, OUTG and OUTB ports are all the square wave signals of PWM pulses output by the OUTR, OUTG and OUTB ports of the 18mA. chip respectively, the square wave signals firstly pass through the photoelectric isolation conversion of an optical coupler EL817, flow into the base electrode of a triode J3Y, and then pass through the current amplification of a triode J3Y, the grid G electrode of a MOS tube N306AD is driven, the switch of the MOS tube is controlled, and the switch and brightness of an LED are controlled by adjusting the pulse width of the pulse square wave signals of the.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when the power supply DC12V inputs the terminal, the wide voltage input of 12-24V can be realized, any common anode 12V or 24V LEDRGB lamp or single-color lamp can be controlled, and the full-color effect with rich variation effect can be realized by matching with an external LED main controller.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: and (3) circuit amplification design: because the three-way current driving load capacity of OUTR/UOTG/OUTB of the traditional WS2811 chip is about 30 mA/way at most, the decoder drives a larger driving current N-channel MOS tube N306AD through the current amplification effect of a primary signal NPN triode J3Y, the current can reach 8A/way, and the current is increased to more than 260 times. The amplifier circuit design is shown in figure 2.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the decoder control circuit may be cascaded up to 1024 times, the cascade schematic being shown in fig. 3.

Further, the invention provides a 65536 gray scale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the 48BIT data is transmitted with the left high order first, and the data is transmitted in the order of RGB. 48 bits can be split into 68 bits of data to be sent, the low level time between bytes does not exceed the time of a RESET signal, otherwise, a chip is RESET, and data is received again after RESET, so that data transmission cannot be realized. The data transmission format is shown in figure 4.

The embodiments described in this specification are only for illustrating the technical solutions of the present invention and not for limiting the present invention. Those skilled in the art can obtain technical solutions through logical analysis, reasoning or limited experiments according to the concepts of the present invention, and all such technical solutions are within the scope of the present invention.

Description of the drawings:

FIG. 1 is a 65536 grayscale LED constant voltage 3-channel decoding control circuit diagram;

FIG. 2 is an amplifier circuit layout;

FIG. 3 is a decoder cascade diagram;

FIG. 4 is a diagram of a data transmission format;

fig. 5 is a circuit diagram of a conventional LED constant voltage 3-channel decoding control apparatus.

Claims (9)

1. A65536 gray scale LED constant voltage 3-channel decoding control circuit is characterized in that: the direct current power supply control circuit comprises a direct current power supply DC terminal, a current-limiting resistor R13200 ohm, a power supply indicator lamp, a rectifier diode SS14, a capacitor C1104 UF, a resistor R11000 ohm, a capacitor C3014 UF, an 8903 IC chip U1, a capacitor C2104 UF, a resistor R068 ohm, a resistor Ri 68 ohm, a resistor R-R2200 ohm, a resistor R-B2200 ohm, a resistor R-G2200 ohm, switch diodes LL 41483 (DR, DG and DB), a resistor R-R12000 ohm, a resistor R-G12000 ohm and a resistor R-B12000 ohm; the power supply terminal is connected with the power supply end of UCS8903 and one end of R-R, R-G, R-B and R1, the foot 5 of UCS8903 is connected with R-B1, the foot 3 of UCS8903 is connected with R-G1, the foot 1 of UCS8903 is connected with R-R1, and the other end of R-R, R-G, R-B is connected with optical couplers UR, UG and UB through DR, DG and DB respectively.

2. A 65536 gray scale LED constant voltage 3-channel decoding control circuit as claimed in claim 1, wherein: the number of optical couplers EL 8173 (UR, UG and UB), the resistance R2470 ohm, the resistance R-R310000 ohm, the resistance R-G310000 ohm, the resistance R-B310000 ohm, the resistance R-R210000 ohm, the resistance R-G210000 ohm and the resistance R-B210000 ohm; the three optical couplers are respectively connected into the triodes DR, DG and DB through the resistors R-R-1, R-G-1 and R-B-1, and are connected into the corresponding load LED lamps through turning off the corresponding MOS tubes QR, QG and QB.

3. A 65536 gray scale LED constant voltage 3-channel decoding control circuit as claimed in claim 2, wherein: the power indicator lights are on when the power DC12V input terminals.

4. A 65536 gray scale LED constant voltage 3-channel decoding control circuit as claimed in claim 3, wherein: when a power supply DC12V is input to a terminal, the power supply DC12V is rectified by a diode D1, filtered by a ceramic chip capacitor C1 and an electrolytic capacitor C3, and divided by a resistor R1 to obtain pure direct current voltage 5V, and the pure direct current voltage is input to a 2-pin VDD port of UCS8903, wherein the diode D1 prevents the anode and cathode of the input end power supply from being reversely connected, effectively protects the main control chip UCS8903, and a power supply indicating circuit is formed by the R1 and an LED to display whether the power supply 12VDC is correctly connected or not.

5. A 65536 gray scale LED constant voltage 3-channel decoding control circuit as claimed in claim 4, wherein: when the power DC12V inputs a terminal, a 5-pin DOUT of the UCS8903 chip displays a cascade data signal input end, and a 6-pin DIN displays a cascade data signal output end; the controller signal or the previous stage cascade signal is input to the 5-pin DOUT of the UCS8903 through the signal matching and protection resistor RI, after corresponding data is intercepted by the processor of the chip, the remaining data is reshaped and forwarded, and is transmitted to the next stage chip through the signal matching and protection resistor RO; the RI and RO resistors prevent damage to the IC input and output terminals under the conditions of live plugging or reverse connection of a power supply and a signal line.

6. A 65536 gray scale LED constant voltage 3-channel decoding control circuit as claimed in claim 5, wherein:

when a power supply DC12V inputs a terminal, a 7-pin SET port of a chip controls the magnitude of OUTR, OUTG and OUTB driving currents, when the power supply DC12V is suspended, the RGB output port is 18mA, and when the power supply DC12V is connected with VDD is 32mA, the scheme is suspended, namely the currents of the OUTR, OUTG and OUTB ports are all the square wave signals of PWM pulses output by the OUTR, OUTG and OUTB ports of the 18mA. chip respectively, the square wave signals firstly pass through the photoelectric isolation conversion of an optical coupler EL817, flow into the base electrode of a triode J3Y, and then pass through the current amplification of a triode J3Y, the grid G electrode of a MOS tube N306AD is driven, the switch of the MOS tube is controlled, and the switch and brightness of an LED are controlled by adjusting the pulse width of the pulse square wave signals of the.

7. A 65536 gray scale LED constant voltage 3-channel decoding control circuit as claimed in claim 6, wherein:

when the power supply DC12V inputs the terminal, the wide voltage input of 12-24V can be realized, any common anode 12V or 24V LEDRGB lamp or single-color lamp can be controlled, and the full-color effect with rich variation effect can be realized by matching with an external LED main controller.

8. A 65536 gray scale LED constant voltage 3-channel decoding control circuit as claimed in claim 7, wherein: and (3) circuit amplification design: because the three-way current driving load capacity of OUTR/UOTG/OUTB of the traditional WS2811 chip is about 30 mA/way at most, the decoder drives a larger driving current N-channel MOS tube N306AD through the current amplification effect of a primary signal NPN triode J3Y, the current can reach 8A/way, and the current is increased to more than 260 times.

9. A 65536 gray scale LED constant voltage 3-channel decoding control circuit as claimed in claim 8, wherein: the left high order is sent first when 48BIT data are sent, and the data are sent according to the RGB sequence; 48 bits can be split into 68 bits of data to be sent, the low level time between bytes does not exceed the time of a RESET signal, otherwise, a chip is RESET, and data is received again after RESET, so that data transmission cannot be realized.

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