Nine-channel constant current driving cascade circuit

Abstract

The utility model discloses a nine-channel constant current drive cascade circuit, and relates to a series of fields requiring intelligent control and memorizing of different scenes, such as LED illuminating lamp dimming, LED control protocols and the like. Comprising a DC power supply DC wiring terminal positive electrode, a DC power supply DC wiring terminal negative electrode, and current limiting resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17 and R18. A protection resistor R19, a protection resistor R20 and a protection resistor R21; the LED lamp further comprises light emitting diodes D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17 and D18. The circuit also comprises capacitors C1, C2 and C3. Comprising backward diodes TD1 and TD2; the system also comprises a TM1926 chip U1, a TM1926 chip U2, and a micro control unit (MCU). The PWM brightness of the output port of the circuit can be independently set through an external controller, the number of peripheral devices is small, the circuit cost can be remarkably reduced, the performance is stable and reliable, and technical support is provided for merging TTL signal fantasy lamps into an integrated Internet of Things system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to artificial intelligence internet of things field relates to LED lighting lamp dimming, LED control protocol etc. BACKGROUND

[0002] With the continuous development of artificial intelligence internet of things, people's requirements for LED lighting control interconnection function are higher and higher, not only have higher requirements for light intensity adjustment, but also have higher requirements for LED lighting protocol communication in life. At present, LED lighting lamp scene scheme control is mostly used for three-channel RGB line lamp, RGB spotlight etc., compared with the low-cost use of multi-channel LED lamp, which becomes an obstacle to the rapid development of new technology, and compared with the rapid development of artificial intelligence internet of things, the technology is far behind, and the multi-channel low-cost protocol control scheme becomes a problem to be solved.

[0003] In view of the above problems, it is urgent to develop a 9-channel constant current drive cascade circuit to solve the problem of multi-channel low-cost control protocol LED fantasy color lamp. CONTENT OF THE UTILITY MODEL

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a 9-channel constant current drive cascade circuit, which is internally integrated with MCU single-wire digital interface, square wave oscillator, LED constant current drive, PWM luminance control and other circuits. The drive circuit can be cascaded through a single-wire signal interface, and the external controller can control the circuit and the subsequent circuit cascaded therewith through a single signal line.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a 9-channel constant current drive cascade circuit, which comprises DC power supply DC connection terminal positive and negative poles, current limiting resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, protection resistors R19, R20, R21, light emitting diodes D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, capacitors C1, C2, C3, reverse diodes TD1, TD2, TM1926 chip U1, TM1926 chip U2 and micro control unit (MCU).

[0006] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: the micro control unit (MCU) is accessed by the protection resistance in the TM1926 chip, TM1926 chip is accessed by its OR, OG, OB port corresponding the light emitting diode and is accessed by corresponding the current-limiting resistance in the DC power supply DC terminal positive pole V+, TM1926 chip is established signal cascade by protection resistance.

[0007] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: micro control unit (MCU) DOUT end is accessed by protection resistance R19 in TM1926 chip U1 DIN end;Micro control unit (MCU) VCC end accesses one end of capacitor C1 simultaneously and accesses DC power supply DC terminal positive pole V+;Capacitor C1 other end is grounded;Micro control unit (MCU) GND end is grounded and accesses DC power supply DC terminal negative pole V-.

[0008] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: TM1926 chip U1 OR1 end accesses the negative pole of light emitting diode D1, the positive pole of light emitting diode D1 accesses one end of current-limiting resistance R1;Current-limiting resistance R1 other end accesses DC power supply DC terminal positive pole V+;TM1926 chip U1 OG1 end accesses the negative pole of light emitting diode D2, the positive pole of light emitting diode D2 accesses one end of current-limiting resistance R2;Current-limiting resistance R2 other end accesses DC power supply DC terminal positive pole V+;TM1926 chip U1 OB1 end accesses the negative pole of light emitting diode D3, the positive pole of light emitting diode D3 accesses one end of current-limiting resistance R3;Current-limiting resistance R3 other end accesses DC power supply DC terminal positive pole V+.

[0009] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: TM1926 chip U1 OR2 end accesses the negative pole of light emitting diode D4, the positive pole of light emitting diode D4 accesses one end of current-limiting resistance R4;Current-limiting resistance R4 other end accesses DC power supply DC terminal positive pole V+;TM1926 chip U1 OG2 end accesses the negative pole of light emitting diode D5, the positive pole of light emitting diode D5 accesses one end of current-limiting resistance R5;Current-limiting resistance R5 other end accesses DC power supply DC terminal positive pole V+;TM1926 chip U1 OB2 end accesses the negative pole of light emitting diode D6, the positive pole of light emitting diode D6 accesses one end of current-limiting resistance R6;Current-limiting resistance R6 other end accesses DC power supply DC terminal positive pole V+.

[0010] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: TM1926 chip U1 OR3 end is connected with the cathode of light emitting diode D7, the anode of light emitting diode D7 is connected with one end of current-limiting resistance R7;Current-limiting resistance R7 other end is connected with DC power supply DC connection terminal anode V+;TM1926 chip U1 OG3 end is connected with the cathode of light emitting diode D8, the anode of light emitting diode D8 is connected with one end of current-limiting resistance R8;Current-limiting resistance R8 other end is connected with DC power supply DC connection terminal anode V+;TM1926 chip U1 OB3 end is connected with the cathode of light emitting diode D9, the anode of light emitting diode D9 is connected with one end of current-limiting resistance R9;Current-limiting resistance R9 other end is connected with DC power supply DC connection terminal anode V+.

[0011] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: TM1926 chip U1 DO end is connected with the DIN end of TM1926 chip U2 by protection resistance R20;TM1926 chip U1 VDD end is connected with one end of capacitor C2 and simultaneously connected with the cathode of reverse diode TD1;The anode of reverse diode TD1 is connected with DC power supply DC connection terminal anode V+;The other end of capacitor C2 is connected with TM1926 chip U1 GND end and simultaneously connected with DC power supply DC connection terminal negative pole V-.

[0012] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: TM1926 chip U2 OR1 end is connected with the cathode of light emitting diode D10, the anode of light emitting diode D10 is connected with one end of current-limiting resistance R10;Current-limiting resistance R10 other end is connected with DC power supply DC connection terminal anode V+;TM1926 chip U2 OG1 end is connected with the cathode of light emitting diode D11, the anode of light emitting diode D11 is connected with one end of current-limiting resistance R11;Current-limiting resistance R11 other end is connected with DC power supply DC connection terminal anode V+;TM1926 chip U2 OB1 end is connected with the cathode of light emitting diode D12, the anode of light emitting diode D12 is connected with one end of current-limiting resistance R12;Current-limiting resistance R12 other end is connected with DC power supply DC connection terminal anode V+.

[0013] Further, the utility model provides a 9 channel constant current drive cascade circuit still has following characteristics: TM1926 chip U2 OR2 end connects the negative pole of emitting diode D13, the positive pole of emitting diode D13 connects one end of current -limiting resistance R13, the other end of current -limiting resistance R13 connects DC power supply DC connection terminal positive pole V+, TM1926 chip U2 OG2 end connects the negative pole of emitting diode D14, the positive pole of emitting diode D14 connects one end of current -limiting resistance R14, the other end of current -limiting resistance R14 connects DC power supply DC connection terminal positive pole V+, TM1926 chip U2 OB2 end connects the negative pole of emitting diode D15, the positive pole of emitting diode D15 connects one end of current -limiting resistance R15, the other end of current -limiting resistance R15 connects DC power supply DC connection terminal positive pole V+.

[0014] Further, the utility model provides a 9 channel constant current drive cascade circuit still has following characteristics: TM1926 chip U2 OR3 end connects the negative pole of emitting diode D16, the positive pole of emitting diode D16 connects one end of current -limiting resistance R16, the other end of current -limiting resistance R16 connects DC power supply DC connection terminal positive pole V+, TM1926 chip U2 OG3 end connects the negative pole of emitting diode D17, the positive pole of emitting diode D17 connects one end of current -limiting resistance R17, the other end of current -limiting resistance R17 connects DC power supply DC connection terminal positive pole V+, TM1926 chip U2 OB3 end connects the negative pole of emitting diode D18, the positive pole of emitting diode D18 connects one end of current -limiting resistance R18, the other end of current -limiting resistance R18 connects DC power supply DC connection terminal positive pole V+.

[0015] Further, the utility model provides a 9 channel constant current drive cascade circuit still has following characteristics: TM1926 chip U2 DO end connects the DIN end of next stage TM1926 chip through protection resistance R21, TM1926 chip U2 VDD end connects one end of capacitor C3 and the negative pole of reverse diode TD2 simultaneously, the positive pole of reverse diode TD2 connects DC power supply DC connection terminal positive pole V+, the other end of capacitor C3 connects TM1926 chip U3 GND end and DC power supply DC connection terminal negative pole V- simultaneously.

[0016] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: TM1926 chip U1 DIN end receives single line serial signal and address coding after power reset success Micro Control Unit (MCU) sends and carries out serial decoding, after receiving 72 bit data, DO port starts shaping forwarding data that DIN end continues to send, provides input data for next cascade chip;Before forwarding data, DO port is always high level;If DIN port input Reset reset signal, chip will be reset according to the 72 bit data received after success and set constant current value, and corresponding PWM duty cycle waveform is output to its OR, OG, OB port by interactive square wave oscillator, and chip re-waiting accepts new data;After receiving the beginning 72 bit data, data is automatically shaped and forwarded by DO port, before chip does not accept Reset signal, OR, OG, OB port pin constant current output remains unchanged.

[0017] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have the following characteristics: every TM1926 chip received data is 72bit data, and its data format is: R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0, R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0, R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0 as a frame complete data structure;Every TM1926 chip port OR1, OG1, OB1, OR2, OG2, OB2, OR3, OG3, OB3 correspond to 8 bit data in above-mentioned 72bit data respectively in turn;When sending 72bit data, high bit sends first, data is sent according to the order of RGB, and every 24 bit can be split into 3 8-bit data to send.

[0018] Further, the utility model provides a kind of 9 channel constant current drive cascade circuit, still have following characteristics: 72bit data D1 is sent by micro control unit MCU, after receiving first 72bit data, TM1926 chip U1 still does not forward data D2, micro control unit MCU continues to send 72bit data D2, after receiving second 72bit data D2 again, since TM1926 chip U1 has stored first 72bit data D1, TM1926 chip U1 forwards D2 data by its DO port, TM1926 chip U2 receives data D2 forwarded by TM1926 chip U1, TM1926 chip U2 does not forward data D3 at this time;Micro control unit MCU continues to send data D3, TM1926 chip U1 forwards received D3 to TM1926 chip U2 again, since TM1926 chip U2 has stored data D2, TM1926 chip U2 forwards data D3 to TM1926 chip U3, TM1926 chip U3 receives third 72bit data D3, in turn by analogy;At this time, if micro control unit MCU sends a Reset low level signal, all chips will be reset and control three groups of RGB port output after decoding 72bit data received by each chip, complete a data refresh cycle, and TM1926 chip returns to receiving preparation state again.

[0019] The utility model has the advantages that 9 channel constant current drive cascade circuit can be cascaded through single-line digital interface, and external controller can control the circuit and subsequent circuit cascaded therewith by single line only, PWM luminance of the circuit output port can be set by external controller alone, peripheral devices are few, circuit cost can be reduced significantly, performance is stable and reliable, low-cost control address and brightness data variable by the circuit are realized, so that LED lighting lamp can accurately realize overall space scene change, and technical support is provided for TTL signal fantasy color lamp integration Internet of Things system. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is circuit schematic diagram;

[0021] Figure 2 It is structural schematic diagram;

[0022] Figure 3 It is data receiving and forwarding. DETAILED DESCRIPTION

[0023] The embodiment is the preferred embodiment of the utility model, and other principles and basic structures similar to the embodiment are within the protection scope of the utility model.

[0024] The scheme in the embodiment is a kind of 9 channel constant current drive cascade circuit, please refer to attached Figure 1The utility model discloses a circuit schematic diagram, and the utility model mainly includes DC power supply DC wiring terminal positive and negative pole, current -limiting resistance R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, protection resistance R19, R20, R21, still include emitting diode D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, still include electric capacity C1, C2, C3, include reverse diode TD1, TD2, still include TM1926 chip U1, TM1926 chip U2, microcontrol unit (MCU).

[0025] Further, in the embodiment, the microcontrol unit (MCU) DOUT end is accessed to the TM1926 chip U1 DIN end through the protection resistance R19, the microcontrol unit (MCU) VCC end is accessed to one end of the electric capacity C1 and the DC power supply DC wiring terminal positive pole V+ simultaneously, the electric capacity C1 other end is grounded, and the microcontrol unit (MCU) GND end is grounded and accessed to the DC power supply DC wiring terminal negative pole V-.

[0026] Further, in the embodiment, the TM1926 chip U1 OR1 end is accessed to the negative pole of the emitting diode D1, the positive pole of the emitting diode D1 is accessed to one end of the current -limiting resistance R1, the current -limiting resistance R1 other end is accessed to the DC power supply DC wiring terminal positive pole V+, the TM1926 chip U1 OG1 end is accessed to the negative pole of the emitting diode D2, the positive pole of the emitting diode D2 is accessed to one end of the current -limiting resistance R2, the current -limiting resistance R2 other end is accessed to the DC power supply DC wiring terminal positive pole V+, the TM1926 chip U1 OB1 end is accessed to the negative pole of the emitting diode D3, the positive pole of the emitting diode D3 is accessed to one end of the current -limiting resistance R3, and the current -limiting resistance R3 other end is accessed to the DC power supply DC wiring terminal positive pole V+.

[0027] Further, in the embodiment, the TM1926 chip U1 OR2 end is accessed to the negative pole of the emitting diode D4, the positive pole of the emitting diode D4 is accessed to one end of the current -limiting resistance R4, the current -limiting resistance R4 other end is accessed to the DC power supply DC wiring terminal positive pole V+, the TM1926 chip U1 OG2 end is accessed to the negative pole of the emitting diode D5, the positive pole of the emitting diode D5 is accessed to one end of the current -limiting resistance R5, the current -limiting resistance R5 other end is accessed to the DC power supply DC wiring terminal positive pole V+, the TM1926 chip U1 OB2 end is accessed to the negative pole of the emitting diode D6, the positive pole of the emitting diode D6 is accessed to one end of the current -limiting resistance R6, and the current -limiting resistance R6 other end is accessed to the DC power supply DC wiring terminal positive pole V+.

[0028] Further, in this embodiment, the TM1926 chip U1 OR3 end is connected to the negative electrode of the light-emitting diode D7, and the positive electrode of the light-emitting diode D7 is connected to one end of the current-limiting resistor R7; the other end of the current-limiting resistor R7 is connected to the positive electrode V+ of the DC power supply DC terminal; the TM1926 chip U1 OG3 end is connected to the negative electrode of the light-emitting diode D8, and the positive electrode of the light-emitting diode D8 is connected to one end of the current-limiting resistor R8; the other end of the current-limiting resistor R8 is connected to the positive electrode V+ of the DC power supply DC terminal; the TM1926 chip U1 OB3 end is connected to the negative electrode of the light-emitting diode D9, and the positive electrode of the light-emitting diode D9 is connected to one end of the current-limiting resistor R9; the other end of the current-limiting resistor R9 is connected to the positive electrode V+ of the DC power supply DC terminal.

[0029] Further, in this embodiment, the TM1926 chip U1 DO end is connected to the DIN end of the TM1926 chip U2 through the protection resistor R20; the TM1926 chip U1 VDD end is connected to one end of the capacitor C2 and the negative electrode of the reverse diode TD1 at the same time; the positive electrode of the reverse diode TD1 is connected to the positive electrode V+ of the DC power supply DC terminal; the other end of the capacitor C2 is connected to the TM1926 chip U1 GND end and the negative electrode V- of the DC power supply DC terminal at the same time.

[0030] Further, in this embodiment, the TM1926 chip U2 OR1 end is connected to the negative electrode of the light-emitting diode D10, and the positive electrode of the light-emitting diode D10 is connected to one end of the current-limiting resistor R10; the other end of the current-limiting resistor R10 is connected to the positive electrode V+ of the DC power supply DC terminal; the TM1926 chip U2 OG1 end is connected to the negative electrode of the light-emitting diode D11, and the positive electrode of the light-emitting diode D11 is connected to one end of the current-limiting resistor R11; the other end of the current-limiting resistor R11 is connected to the positive electrode V+ of the DC power supply DC terminal; the TM1926 chip U2 OB1 end is connected to the negative electrode of the light-emitting diode D12, and the positive electrode of the light-emitting diode D12 is connected to one end of the current-limiting resistor R12; the other end of the current-limiting resistor R12 is connected to the positive electrode V+ of the DC power supply DC terminal.

[0031] Further, in this embodiment, the TM1926 chip U2 OR2 end is connected to the negative electrode of the light-emitting diode D13, and the positive electrode of the light-emitting diode D13 is connected to one end of the current-limiting resistor R13; the other end of the current-limiting resistor R13 is connected to the positive electrode V+ of the DC power supply DC terminal; the TM1926 chip U2 OG2 end is connected to the negative electrode of the light-emitting diode D14, and the positive electrode of the light-emitting diode D14 is connected to one end of the current-limiting resistor R14; the other end of the current-limiting resistor R14 is connected to the positive electrode V+ of the DC power supply DC terminal; the TM1926 chip U2 OB2 end is connected to the negative electrode of the light-emitting diode D15, and the positive electrode of the light-emitting diode D15 is connected to one end of the current-limiting resistor R15; the other end of the current-limiting resistor R15 is connected to the positive electrode V+ of the DC power supply DC terminal.

[0032] Further, in this embodiment, the TM1926 chip U2 OR3 end is connected to the negative electrode of the light-emitting diode D16, the positive electrode of the light-emitting diode D16 is connected to one end of the current-limiting resistor R16; the other end of the current-limiting resistor R16 is connected to the positive electrode V+ of the DC power supply DC terminal; the TM1926 chip U2 OG3 end is connected to the negative electrode of the light-emitting diode D17, the positive electrode of the light-emitting diode D17 is connected to one end of the current-limiting resistor R17; the other end of the current-limiting resistor R17 is connected to the positive electrode V+ of the DC power supply DC terminal; the TM1926 chip U2 OB3 end is connected to the negative electrode of the light-emitting diode D18, the positive electrode of the light-emitting diode D18 is connected to one end of the current-limiting resistor R18; the other end of the current-limiting resistor R18 is connected to the positive electrode V+ of the DC power supply DC terminal.

[0033] Further, in this embodiment, the TM1926 chip U2 DO end is connected to the DIN end of the next TM1926 chip through the protection resistor R21; the TM1926 chip U2 VDD end is connected to one end of the capacitor C3 and the negative electrode of the reverse diode TD2 at the same time; the positive electrode of the reverse diode TD2 is connected to the positive electrode V+ of the DC power supply DC terminal; the other end of the capacitor C3 is connected to the TM1926 chip U3 GND end and the negative electrode V- of the DC power supply DC terminal at the same time.

[0034] Further, in this embodiment, please refer to the attached Figure 2 The structure principle diagram, the TM1926 chip U1 DIN end receives the single-wire serial signal and address code sent by the micro control unit (MCU) after the power-on reset succeeds, and serially decodes, after receiving 72-bit data, the DO port starts shaping and forwarding the data continuously sent by the DIN end, providing input data for the next cascade chip; before forwarding the data, the DO port is always high level; if the DIN port inputs the Reset reset signal, the chip will set the constant current value according to the received 72-bit data after the reset succeeds, and output the corresponding PWM duty cycle waveform to the OR, OG, OB ports through the interactive square wave oscillator, and the chip re-waits to accept new data; after receiving the starting 72-bit data, the DO port automatically shapes and forwards the data, and the OR, OG, OB port pins constant current output remains unchanged before the chip accepts the Reset signal.

[0035] Further, in the embodiment, each TM1926 chip receives 72-bit data, and the data format is: R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0, R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0, R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0, R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0, which is a complete data structure of a frame; each port OR1, OG1, OB1, OR2, OG2, OB2, OR3, OG3, OB3 of each TM1926 chip corresponds to 8-bit data of the above 72-bit data in turn; when sending 72-bit data, the high bits are sent first, and the data is sent in the order of RGB, and each 24 bits can be split into 3 8-bit data for sending.

[0036] Further, in the embodiment, please refer to the attached Figure 3 Data receiving and forwarding: the micro control unit MCU sends 72-bit data D1, after the TM1926 chip U1 receives the first 72-bit data, the TM1926 chip U1 has not forwarded the data D2, the micro control unit MCU continues to send 72-bit data D2, the TM1926 chip U1 receives the second 72-bit data D2, and since the TM1926 chip U1 has already stored the first 72-bit data D1, the TM1926 chip U1 forwards the D2 data through the DO port, the TM1926 chip U2 receives the forwarded data D2 of the TM1926 chip U1, and at this time, the TM1926 chip U2 has not forwarded the data D3; the micro control unit MCU continues to send the data D3, the TM1926 chip U1 forwards the received D3 to the TM1926 chip U2, and since the TM1926 chip U2 has already stored the data D2, the TM1926 chip U2 forwards the data D3 to the TM1926 chip U3, the TM1926 chip U3 receives the third 72-bit data D3, and the same is true for the subsequent data; at this time, if the micro control unit MCU sends a Reset low-level signal, all chips will be reset and decode the received 72-bit data to control the three groups of RGB ports to output, complete a data refresh cycle, and the TM1926 chip returns to the receiving preparation state.

[0037] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 9-channel constant current drive cascade circuit, characterized by: Including the positive and negative poles of the DC power supply DC terminal, current limiting resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15, R16, R17, R18; protection resistors R19, R20, R21; also including light emitting diodes D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18; also including Capacitors C1, C2, and C3; including reverse diodes TD1 and TD2; also including TM1926 chip U1, TM1926 chip U2, and microcontroller unit MCU; the microcontroller unit MCU is connected to the TM1926 chip through the protection resistor, the TM1926 chip is connected to the corresponding light-emitting diode through its OR, OG, and OB ports and is connected to the positive pole V+ of the DC power supply DC terminal through the corresponding current-limiting resistor, and the TM1926 chip establishes a signal cascade through the protection resistor.

2. A 9-channel constant current drive cascade circuit according to claim 1, characterized in that: The DOUT terminal of the microcontroller unit is connected to the DIN terminal of the TM1926 chip U1 through the protection resistor R19; the VCC terminal of the microcontroller unit is connected to one end of the capacitor C1 and the positive terminal V+ of the DC power supply; the other end of the capacitor C1 is grounded; the GND terminal of the microcontroller unit is grounded and connected to the negative terminal V- of the DC power supply; the OR1 terminal of the TM1926 chip U1 is connected to the cathode of the light-emitting diode D1, and the anode of the light-emitting diode D1 is connected to one end of the current-limiting resistor R1; the other end of the current-limiting resistor R1 is connected to the positive terminal V+ of the DC power supply; the OG1 terminal of the TM1926 chip U1 is connected to the cathode of the light-emitting diode D2, and the anode of the light-emitting diode D2 is connected to one end of the current-limiting resistor R2; the other end of the current-limiting resistor R2 is connected to the positive terminal V+ of the DC power supply; the OB1 terminal of the TM1926 chip U1 is connected to the cathode of the light-emitting diode D3, and the anode of the light-emitting diode D3 is connected to one end of the current-limiting resistor R3; the other end of the current-limiting resistor R3 is connected to the positive terminal V+ of the DC power supply.

3. A 9-channel constant current drive cascade circuit according to claim 2, characterized in that: The OR2 terminal of the TM1926 chip U1 is connected to the cathode of the light-emitting diode D4, and the anode of the light-emitting diode D4 is connected to one end of the current-limiting resistor R4; the other end of the current-limiting resistor R4 is connected to the positive terminal V+ of the DC power supply DC terminal; the OG2 terminal of the TM1926 chip U1 is connected to the cathode of the light-emitting diode D5, and the anode of the light-emitting diode D5 is connected to one end of the current-limiting resistor R5; the other end of the current-limiting resistor R5 is connected to the positive terminal V+ of the DC power supply DC terminal; the OB2 terminal of the TM1926 chip U1 is connected to the cathode of the light-emitting diode D6, and the anode of the light-emitting diode D6 is connected to one end of the current-limiting resistor R6; the other end of the current-limiting resistor R6 is connected to the positive terminal V+ of the DC power supply DC terminal; the OR3 terminal of the TM1926 chip U1 is connected to the cathode of the light-emitting diode D7, and the anode of the light-emitting diode D7 is connected to one end of the current-limiting resistor R7; the other end of the current-limiting resistor R7 is connected to the positive terminal V+ of the DC power supply DC terminal; the TM1926 chip U1 The OG3 terminal is connected to the cathode of the light-emitting diode D8, and the anode of the light-emitting diode D8 is connected to one end of the current-limiting resistor R8; the other end of the current-limiting resistor R8 is connected to the positive pole V+ of the DC power supply terminal; the OB3 terminal of the TM1926 chip U1 is connected to the cathode of the light-emitting diode D9, and the anode of the light-emitting diode D9 is connected to one end of the current-limiting resistor R9; the other end of the current-limiting resistor R9 is connected to the positive pole V+ of the DC power supply terminal.

4. The 9-channel constant current drive cascade circuit according to claim 3, wherein: The DO terminal of the TM1926 chip U1 is connected to the DIN terminal of the TM1926 chip U2 through the protective resistor R20. The VDD terminal of the TM1926 chip U1 is connected to one end of the capacitor C2 and the cathode of the reverse diode TD1. The anode of the reverse diode TD1 is connected to the positive terminal V+ of the DC power supply DC terminal. The other end of the capacitor C2 is connected to the GND terminal of the TM1926 chip U1 and the negative terminal V- of the DC power supply DC terminal. The OR1 terminal of the TM1926 chip U2 is connected to the cathode of the light-emitting diode D10. The anode of the light-emitting diode D10 is connected to one end of the current-limiting resistor R10. The other end of the current-limiting resistor R10 is connected to the positive terminal V+ of the DC power supply DC terminal. The OG1 terminal of the TM1926 chip U2 is connected to the cathode of the light-emitting diode D11. The anode of the light-emitting diode D11 is connected to one end of the current-limiting resistor R11. The other end of the current-limiting resistor R11 is connected to the positive terminal V+ of the DC power supply DC terminal. The OB1 terminal is connected to the cathode of the light-emitting diode D12, and the anode of the light-emitting diode D12 is connected to one end of the current-limiting resistor R12; the other end of the current-limiting resistor R12 is connected to the positive terminal V+ of the DC power supply DC.

5. The 9-channel constant current drive cascade circuit according to claim 4, characterized in that: Connect the U2 OR2 terminal of the TM1926 chip to the cathode of the light-emitting diode D13, and the anode of the light-emitting diode D13 to one end of the current-limiting resistor R13; the other end of the current-limiting resistor R13 is connected to the positive terminal V+ of the DC power supply; connect the U2 OG2 terminal of the TM1926 chip to the cathode of the light-emitting diode D14, and the anode of the light-emitting diode D14 is connected to one end of the current-limiting resistor R14; the other end of the current-limiting resistor R14 is connected to the positive terminal V+ of the DC power supply; connect the U2 OB2 terminal of the TM1926 chip to the cathode of the light-emitting diode D15, and the anode of the light-emitting diode D15 is connected to one end of the current-limiting resistor R15; the other end of the current-limiting resistor R15 is connected to the positive terminal V+ of the DC power supply; connect the U2 OR3 terminal of the TM1926 chip to the cathode of the light-emitting diode D16, and the anode of the light-emitting diode D16 is connected to one end of the current-limiting resistor R16; the other end of the current-limiting resistor R16 is connected to the positive terminal V+ of the DC power supply.

6. The 9-channel constant current drive cascade circuit according to claim 5, characterized in that: Connect the OG3 terminal of the TM1926 chip U2 to the cathode of the light-emitting diode D17, and the anode of the light-emitting diode D17 to one end of the current-limiting resistor R17. The other end of the current-limiting resistor R17 is connected to the positive terminal V+ of the DC power supply. Connect the OB3 terminal of the TM1926 chip U2 to the cathode of the light-emitting diode D18, and the anode of the light-emitting diode D18 to one end of the current-limiting resistor R18. The other end of the current-limiting resistor R18 is connected to the positive terminal V+ of the DC power supply. Connect the DO terminal of the TM1926 chip U2 to the DIN terminal of the next-level TM1926 chip through the protection resistor R21. Connect the VDD terminal of the TM1926 chip U2 to one end of the capacitor C3 and the cathode of the reverse diode TD2. The anode of the reverse diode TD2 is connected to the positive terminal V+ of the DC power supply. Connect the other end of the capacitor C3 to the GND terminal of the TM1926 chip U3 and the negative terminal V- of the DC power supply.

7. The 9-channel constant current drive cascade circuit according to claim 1, characterized in that: After a successful power-on reset, the TM1926 chip U1 DIN end receives the single-line serial signal and address code sent by the microcontroller unit MCU for serial decoding. After receiving 72 bits of data, the DO port begins to reshape and forward the data sent by the DIN end to provide input data for the next cascade chip. Before forwarding the data, the DO port is always at a high level. If the DIN port inputs a Reset signal, the chip will set the constant current value according to the received 72 bits of data after a successful reset, and output the corresponding PWM duty cycle waveform to its OR, OG, and OB ports through the interactive square wave oscillator, and the chip will wait for new data again. After receiving the initial 72 bits of data, the data is automatically reshaped and forwarded through the DO port. Before the chip receives the Reset signal, the constant current output of the OR, OG, and OB port pins remains unchanged.

8. The 9-channel constant current drive cascade circuit according to claim 7, characterized in that: The data received by each TM1926 chip is 72-bit data, and its data format is: R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0, R7, R6, R5, R4, R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0, R7, R6, R5, R4 , R3, R2, R1, R0, G7, G6, G5, G4, G3, G2, G1, G0, B7, B6, B5, B4, B3, B2, B1, B0 is a complete data structure of one frame; each TM1926 chip port OR1, OG1, OB1, OR2, OG2, OB2, OR3, OG3, OB3 corresponds to 8 bits of data in the above 72-bit data respectively; when sending 72-bit data, the high bit is sent first and the data is sent in the order of RGB. Every 24 bits can be split into 3 8-bit data to be sent.

9. The 9-channel constant current drive cascade circuit according to claim 8, characterized in that: The microcontroller unit MCU sends 72-bit data D1. After the TM1926 chip U1 receives the first 72-bit data, the TM1926 chip U1 has not forwarded data D2. The microcontroller unit MCU continues to send 72-bit data D2. After the TM1926 chip U1 receives the second 72-bit data D2, since the TM1926 chip U1 already stores the first 72-bit data D1, the TM1926 chip U1 forwards the D2 data through its DO port. The TM1926 chip U2 receives the data D2 forwarded by the TM1926 chip U1. At this time, the TM1926 chip U2 has not forwarded data D3. The control unit MCU continues to send data D3, and the TM1926 chip U1 forwards the received D3 to the TM1926 chip U2. Since the TM1926 chip U2 already stores the data D2, the TM1926 chip U2 forwards the data D3 to the TM1926 chip U3. The TM1926 chip U3 receives the third 72-bit data D3, and so on. At this time, if the microcontroller unit MCU sends a Reset low-level signal, all chips will be reset and decode the 72-bit data they received and control the output of the three groups of RGB ports, completing a data refresh cycle. The TM1926 chip returns to the receiving ready state.

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