A 65536 grayscale LED constant voltage 3-channel decoding control circuit

Abstract

The present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, including: a power supply terminal is connected to a UCS8903 power supply terminal and one end of R‑R, R‑G, R‑B, and R1, UCS8903 pin 5 is connected to R‑B1, UCS8903 pin 3 is connected to R‑G1, UCS8903 pin 1 is connected to R‑R1, and the other ends of R‑R, R‑G, and R‑B are connected to optical couplers UR, UG, and UB through DR, DG, and DB respectively. The three optical couplers are connected to transistors DR, DG, and DB through resistors R‑R‑1, R‑G‑1, and R‑B‑1 respectively, and the corresponding load LED lamps are connected by turning off the corresponding MOS tubes QR, QG, and QB. The advantage is that by changing the grayscale level of the control chip, a higher level of grayscale is provided for the decoder to meet the color grayscale needs of the computer display screen, and by changing the line control mode, a reliable guarantee is provided for controlling the output of high-power LED lamps, breakpoint continuation, and direct feedback of isolated loads.

Description

Technical Field

[0001] The invention belongs to the field of intelligent control of LED lamps, and relates to a driving decoding circuit for controlling LED lamp loads with high grayscale under specific conditions by an LED intelligent control system. Background Art

[0002] Figure 5 It is a traditional LED constant voltage 3-channel decoding control device circuit, such as Figure 5 As shown, the WS2811 grayscale level is only 256 grayscales; the control system equipment sends the control program to the WS2811 control module through the DAT and GND ports; the WS2811 main control chip VDD / OUTR / UOTG / OUTB is the load output port and is connected to the load LED lamp without a gap circuit; DIN / GND is the signal input terminal, DO / GND is the signal output terminal, 33R is the line current limiting resistor, and 104 is the capacitor to discharge the load; the RGB lamp beads of the lamp are 3 in a group, and 3 lamp beads of each color of R, G, and B are in a group. The input voltage is 12V, and it is connected to the WS2811 control through RR and R1. Each load of the lamp does not exceed 1W, and the power is too small. If the load short circuit, overvoltage, overcurrent and other faults occur or static electricity is introduced, it is very easy to cause the main control chip WS2811 to burn and electrical breakdown. Once the main control chip is burned or broken down, a breakpoint will be formed in the main circuit, the signal cannot be transmitted, and the subsequent load will no longer be controlled by the main control system. Summary of the invention

[0003] The present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control device, as shown in the attached Figure 1 As shown, it includes a DC power supply DC terminal, a current limiting resistor R1 with a resistance value of 3200 ohms, a power indicator light, a rectifier diode SS14, a capacitor C1 with a capacitance value of 104μF, a resistor R11 with a resistance value of 1000 ohms, a capacitor C3 with a capacitance value of 14μF, a UCS8903 chip U1, a capacitor C2 with a capacitance value of 104μF, a resistor R0 with a resistance value of 68 ohms, a resistor Ri with a resistance value of 68 ohms, a resistor RR with a resistance value of 2200 ohms, a resistor RB with a resistance value of 2200 ohms, a resistor RG with a resistance value of 2200 ohms, three switching diodes LL4148, namely DR, DG, and DB, a resistor R-R1 with a resistance value of 2000 ohms, a resistor R-G1 with a resistance value of 2000 ohms, and a resistor R-B1 with a resistance value of 2000 ohms.

[0004] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: it includes 3 optical couplers EL817, namely UR, UG, and UB, a resistor R2 with a resistance value of 470 ohms, a resistor R-R3 with a resistance value of 10,000 ohms, a resistor R-G3 with a resistance value of 10,000 ohms, a resistor R-B3 with a resistance value of 10,000 ohms, a resistor R-R2 with a resistance value of 10,000 ohms, a resistor R-G2 with a resistance value of 10,000 ohms, and a resistor R-B2 with a resistance value of 10,000 ohms.

[0005] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: including a resistor RR-1 with a resistance value of 1000 ohms, a resistor RG-1 with a resistance value of 1000 ohms, a resistor RB-1 with a resistance value of 1000 ohms, three transistors J3Y respectively QR, QG, QB, three MOS tubes N306AD, a voltage regulator diode LL4148 D0, and an LED lamp output terminal.

[0006] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: including a power terminal connected to the UCS8903 chip U1 power supply end and one end of RR, RG, RB, and R1, UCS8903 chip U1 pin 5 connected to R-B1, UCS8903 chip U1 pin 3 connected to R-G1, UCS8903 chip U1 pin 1 connected to R-R1, and the other ends of RR, RG, and RB are connected to optical couplers UR, UG, and UB through DR, DG, and DB respectively.

[0007] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the three optical couplers UR, UG, and UB are respectively connected to the transistors QR, QG, and QB through resistors RR-1, RG-1, and RB-1, and are connected to the corresponding load LED lamp by turning off the corresponding MOS tubes PR, PG, and PB.

[0008] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when the power supply DC12V is input to the terminal, the power indicator light is on.

[0009] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when the power supply DC12V is input to the terminal, it is first rectified by the diode D1, then filtered by the ceramic capacitor C1 and the electrolytic capacitor C3, and finally divided by the resistor R11 to obtain a pure DC voltage of 5V, which is input to the 2-pin VDD port of the UCS8903 chip U1, wherein the diode D1 prevents the positive and negative poles of the input power supply from being reversely connected, effectively protecting the UCS8903 chip U1, and R1 and the LED form a power indication circuit to display whether the power supply 12VDC is present and whether it is correctly connected.

[0010] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when the power supply DC12V is input to the terminal, the UCS8903 chip U1 pin 5 DOUT displays the cascade data signal input terminal, and the UCS8903 chip U1 pin 6 DIN displays the cascade data signal output terminal. The controller signal or the previous level cascade signal is input to the UCS8903 chip U1 pin 5 DOUT through the signal matching and protection resistor RI. After the chip's own processor intercepts part of the corresponding data, the remaining data is shaped and forwarded, and is transmitted to the next level chip through the signal matching and protection resistor RO. The RI and RO resistors prevent the UCS8903 chip input and output terminals from being damaged in situations such as live plugging or reverse connection of the power and signal lines.

[0011] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when the power supply DC12V is input to the wiring terminal, the pin 7 SET port of the UCS8903 chip U1 controls the size of the OUTR, OUTG, and OUTB driving currents. When suspended, the RGB output port is 18mA, and connected to VDD is 32mA. The OUTR, OUTG, and OUTB ports of the UCS8903 chip respectively output PWM pulse square wave signals, which are first converted by the optocoupler EL817 through photoelectric isolation, flow into the base of the transistor J3Y, and then amplified by the current of the transistor J3Y to drive the gate G of the MOS tube N306AD to control the MOS tube switch, thereby achieving the function of controlling the switch and brightness of the LED by adjusting the pulse width of the PWM pulse square wave signal, and the pulse width of the PWM is proportional to the brightness of the LED light strip.

[0012] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when the power supply DC12V is input to the terminal, a wide voltage input of 12-24V can be achieved, and any common anode 12V or 24V LED RGB lamp or monochrome lamp can be controlled. In conjunction with an external LED main controller, rich and varied full-color effects can be achieved.

[0013] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: Circuit amplification design: Because the three-way current driving load capacity of OUTR / UOTG / OUTB of the traditional WS2811 chip is generally about 30mA / way at most, and the decoder drives the larger driving current N-channel MOS tube N306AD through the current amplification effect of the primary signal NPN transistor J3Y, the current can reach 8A / way, and the current is increased by more than 260 times. The amplification circuit design is shown in the attached Figure 2 .

[0014] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: the decoder control circuit can be cascaded up to 1024 times, and the cascade diagram is shown in the attached Figure 3 .

[0015] Furthermore, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit, which also has the following characteristics: when 48BIT data is sent, the left high bit is sent first, and the data is sent in the order of RGB. 48 bits can be split into 6 8-bit data to send. Note that the low level time between bytes should not exceed the RESET signal time, otherwise the chip will reset. After the reset, the data is received again, and the data transmission cannot be realized. The data transmission format is shown in the attached Figure 4 .

[0016] The beneficial effects of the present invention are: by changing the grayscale level of the control chip, a higher level of grayscale is provided for the decoder to meet the color grayscale requirements of the computer display screen, and by changing the line control mode, reliable guarantees are provided for controlling the output of high-power LED lamps, breakpoint resumption, and direct feedback of isolated loads.

[0017] The description in this specification is to illustrate the case implemented according to this scheme. The above embodiments are only used to illustrate the technical scheme of the present invention and are not intended to limit the present invention. Any technical scheme that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments according to the concept of the present invention should be within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a 65536 grayscale LED constant voltage 3-channel decoding control circuit diagram;

[0019] Figure 2 It is the design diagram of the amplifier circuit;

[0020] Figure 3 is a schematic diagram of the decoder cascade;

[0021] Figure 4 It is a data transmission format diagram;

[0022] Figure 5 It is a traditional LED constant voltage 3-channel decoding control device circuit diagram. DETAILED DESCRIPTION

[0023] The solution in this embodiment is a 65536 grayscale LED constant voltage 3-channel decoding control circuit. Figure 1 65536 grayscale LED constant voltage 3-channel decoding control circuit, including DC power supply DC terminal, 3200 ohm current limiting resistor R1, power indicator light, rectifier diode SS14, 104μF capacitor C1, 1000 ohm resistor R11, 14μF capacitor C3, UCS8903 chip U1, 104μF capacitor C2, 68 ohm resistor R0, 68 ohm resistor Ri, 2200 ohm resistor RR, 2200 ohm resistor RB, 2200 ohm resistor RG, 3 switching diodes LL4148, DR, DG, DB, 2000 ohm resistor R-R1, 2000 ohm resistor R-G1, 2000 ohm resistor R-B1.

[0024] Further, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit also having the following characteristics: including 3 optical couplers EL817, namely UR, UG, and UB, a resistor R2 with a resistance value of 470 ohms, a resistor R-R3 with a resistance value of 10,000 ohms, a resistor R-G3 with a resistance value of 10,000 ohms, a resistor R-B3 with a resistance value of 10,000 ohms, a resistor R-R2 with a resistance value of 10,000 ohms, a resistor R-G2 with a resistance value of 10,000 ohms, and a resistor R-B2 with a resistance value of 10,000 ohms.

[0025] Further, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit also having the following characteristics: including a resistor RR-1 with a resistance value of 1000 ohms, a resistor RG-1 with a resistance value of 1000 ohms, a resistor RB-1 with a resistance value of 1000 ohms, three transistors J3Y respectively QR, QG, QB, three MOS tubes N306AD, a voltage regulator diode LL4148 D0, and an LED lamp output terminal.

[0026] Furthermore, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit also having the following characteristics: including a power terminal connected to the UCS8903 chip U1 power supply end and one end of RR, RG, RB, and R1, UCS8903 chip U1 pin 5 connected to R-B1, UCS8903 chip U1 pin 3 connected to R-G1, UCS8903 chip U1 pin 1 connected to R-R1, and the other ends of RR, RG, and RB are connected to optical couplers UR, UG, and UB through DR, DG, and DB respectively.

[0027] Furthermore, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit also having the following characteristics: the three optical couplers UR, UG, and UB are respectively connected to the transistors QR, QG, and QB through resistors RR-1, RG-1, and RB-1, and the corresponding load LED lamps are connected by turning off the corresponding MOS tubes PR, PG, and PB.

[0028] Furthermore, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit which also has the following characteristics: when the power supply DC12V is input to the terminal, the power indicator light is on.

[0029] Furthermore, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit also having the following characteristics: when the power supply DC12V is input to the terminal, it is first rectified by the diode D1, then filtered by the ceramic capacitor C1 and the electrolytic capacitor C3, and finally divided by the resistor R11 to obtain a pure DC voltage of 5V, which is input to the UCS8903 chip U1 pin 2 VDD port, wherein the diode D1 prevents the positive and negative poles of the input power supply from being reversed, effectively protecting the UCS8903 chip U1, and R1 and the LED form a power indication circuit to display whether the power supply 12VDC is present and whether it is correctly connected.

[0030] Furthermore, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit which also has the following characteristics: when the power supply DC12V is input to the terminal, the UCS8903 chip U1 pin 5 DOUT displays the cascade data signal input terminal, and the pin 6 DIN displays the cascade data signal output terminal. The controller signal or the previous level cascade signal is input to the UCS8903 chip U1 pin 5 DOUT through the signal matching and protection resistor RI, and after the chip processor intercepts part of the corresponding data, the remaining data is shaped and forwarded, and is transmitted to the next level chip through the signal matching and protection resistor RO. The RI and RO resistors prevent damage to the chip IC input and output terminals in the case of live plugging or reverse connection of the power and signal lines.

[0031] Further, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit also having the following characteristics: when the power supply DC12V is input to the terminal, the UCS8903 chip U1 pin 7 SET port controls the size of the OUTR, OUTG, and OUTB drive currents. When suspended, the RGB output port is 18mA, and connected to VDD is 32mA. The OUTR, OUTG, and OUTB ports of the chip respectively output PWM pulse square wave signals, which are first converted by the optocoupler EL817 through photoelectric isolation, flow into the base of the transistor J3Y, and then amplified by the current of the transistor J3Y to drive the gate G of the MOS tube N306AD to control the MOS tube switch, thereby adjusting the pulse width of the PWM pulse square wave signal to achieve the effect of controlling the switch and brightness of the LED, and the pulse width of the PWM is proportional to the brightness of the LED light strip.

[0032] Furthermore, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit also having the following characteristics: when the power supply DC12V is input to the terminal, a wide voltage input of 12-24V can be achieved, and any common anode 12V or 24V LED RGB lamp or monochrome lamp can be controlled, and rich changing effects and full-color effects can be achieved in conjunction with an external LED main controller.

[0033] Further, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit which also has the following features: Figure 2 Amplification circuit design diagram, this decoder drives the N-channel MOS tube N306AD with a larger driving current through the current amplification effect of the primary signal NPN transistor J3Y. The current can reach 8A / channel, and the current is increased by more than 260 times.

[0034] Further, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit which also has the following features: Figure 3 Decoder cascade diagram. The decoder control circuit can be cascaded up to 1024 times.

[0035] Further, in this embodiment, the present invention provides a 65536 grayscale LED constant voltage 3-channel decoding control circuit which also has the following features: Figure 4 Data transmission format diagram, when 48BIT data is sent, the high bit on the left is sent first, and the data is sent in the order of RGB. 48 bits can be split into 6 8-bit data to send. Note that the low level time between bytes should not exceed the RESET signal time, otherwise the UCS8903 chip will be reset. After reset, it will receive data again, and data transmission cannot be achieved.

Claims

1. A 65536 grayscale LED constant voltage 3-channel decoding control circuit, characterized in that: Including DC power supply DC terminal, current limiting resistor R1 with a resistance value of 3200 ohms, power indicator light, rectifier diode SS14, capacitor C1 with a capacitance value of 104μF, resistor R11 with a resistance value of 1000 ohms, capacitor C3 with a capacitance value of 14μF, UCS8903 chip U1, capacitor C2 with a capacitance value of 104μF, resistor R0 with a resistance value of 68 ohms, resistor RI with a resistance value of 68 ohms, resistor RR with a resistance value of 2200 ohms, resistor RB with a resistance value of 2200 ohms, resistor RG with a resistance value of 2200 ohms, switching diodes LL41483, DR, DG, DB, resistor R-R1 with a resistance value of 2000 ohms, resistor R-G1 with a resistance value of 2000 ohms, resistor R-B1 with a resistance value of 2000 ohms; the power terminal is connected to the power supply end of UCS8903 chip U1 and RR, RG, RB, R1 At one end, UCS8903 chip U1 pin 5 is connected to R-B1, UCS8903 chip U1 pin 3 is connected to R-G1, UCS8903 chip U1 pin 1 is connected to R-R1, RR, RG, RB are connected to the optocouplers UR, UG, UB through DR, DG, DB respectively at the other end; the three optocouplers EL817 are UR, UG, UB, the resistance value of 470 ohm resistor R2, the resistance value of 10000 ohm resistor R-R3, the resistance value of 10000 ohm resistor R-G3, the resistance value of 10000 ohm resistor R-B3, the resistance value of 10000 ohm resistor R-R2, the resistance value of 10000 ohm resistor R-G2, the resistance value of 10000 ohm resistor R-B2; the three optocouplers UR, UG, UB are connected through resistors RR-1, RG-1, RB-1 respectively. Connect to transistors QR, QG, QB, turn off the corresponding MOS tubes PR, PG, PB, connect to the corresponding load LED light, and when the power supply DC12V is input to the terminal, the power indicator light is on.

2. The 65536 grayscale LED constant voltage 3-channel decoding control circuit according to claim 1, characterized in that: When the power supply DC12V is input to the terminal, it is first rectified by diode D1, then filtered by ceramic capacitor C1 and electrolytic capacitor C3, and finally divided by resistor R11 to obtain a pure DC voltage of 5V, which is input to the VDD port of UCS8903 chip U1 pin 2. Diode D1 prevents the positive and negative poles of the input power supply from being reversed, effectively protecting UCS8903 chip U1. R1 and LED form a power indication circuit to display whether the power supply 12VDC is present and whether it is correctly connected.

3. The 65536 grayscale LED constant voltage 3-channel decoding control circuit according to claim 1 is characterized in that: When the power supply is DC12V, the UCS8903 chip U1 pin 5 DOUT displays the cascade data signal input terminal, and the pin 6DIN displays the cascade data signal output terminal; the controller signal or the previous level cascade signal is input to the UCS8903 chip U1 pin 5 DOUT through the signal matching and protection resistor RI, and after the chip's own processor intercepts part of the corresponding data, the remaining data is shaped and forwarded, and is transmitted to the next level chip through the signal matching and protection resistor RO; the RI and RO resistors prevent damage to the IC input and output terminals in cases of live plugging or reverse connection of the power and signal lines.

4. The 65536 grayscale LED constant voltage 3-channel decoding control circuit according to claim 1 is characterized in that: When the power supply DC12V is input to the terminal, the 7-pin SET port of the chip controls the size of the OUTR, OUTG, and OUTB driving current. When it is suspended, the RGB output port is 18mA, and connected to VDD is 32mA. The OUTR, OUTG, and OUTB ports of the chip output PWM pulse square wave signals respectively, which are first converted by the optocoupler EL817 for photoelectric isolation, and flow into the base of the transistor J3Y respectively, and then amplified by the current of the transistor J3Y respectively, and drive the gate G of the MOS tube N306AD respectively, and control the MOS tube switch, thereby adjusting the pulse width of the PWM pulse square wave signal. The pulse width of the PWM is proportional to the brightness of the LED lamp.

Images