Multi-channel high-precision constant-current driving system without crosstalk output and design method

Abstract

The invention discloses a multi-channel high-precision constant-current driving system without crosstalk output and a design method. The system comprises L constant-current driving board cards and a power supply board card, the L constant current drive board cards and the power supply board card are cascaded through the internal electric connector module to realize structural and electrical connection; the L constant-current driving board cards are obtained by configuring L general constant-current driving board cards through different jumper modules, so that the plurality of constant-current driving board cards are ensured to be cascaded and share the power supply board card; all ground signals included in all the constant-current driving circuits independently flow back to the decoupling capacitor grounding end of the power output end through the inner electric connector, and finally single-point common ground is achieved, so that crosstalk current between channels is effectively reduced, and the effect is superior to one order of magnitude. And meanwhile, the device has the advantages of small size, light weight, low cost, modularization and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of constant current drive power supply design, and in particular relates to a multi-channel high-precision constant current drive system with output crosstalk-free and a design method thereof. Background Art

[0002] High-power magnetoplasma propulsion (MPDT) is suitable for long-distance unmanned deep space exploration missions such as asteroid exploration and interplanetary round-trip transportation platforms. MPDT uses high-power electromagnetic thrusters as actuators, and requires a high-precision storage and supply system to provide it with a stable supply of propellant. The key electromagnetic valve components in the high-precision storage and supply system need to be driven by a multi-channel bipolar constant current source. In order to achieve the expected control accuracy, the output current accuracy of each channel constant current drive within the full range of ±2.5A is required to be better than ±0.4mA, and the output crosstalk current between each channel is less than ±0.4mA. In addition, the active vibration isolation precision pointing control system of the new generation of "three super" satellite platforms uses multi-channel voice coil motors as actuators, which need to be driven by a multi-channel bipolar constant current source. In order to achieve the expected control accuracy, the output current accuracy of each channel constant current drive within the full range of ±3A is required to be better than ±0.4mA, and the output crosstalk current between each channel is less than ±0.4mA. According to the survey, there is currently no aerospace-grade multi-channel constant current drive system that meets the above requirements.

[0003] In the prior art, in order to improve the driving capability and ensure the output current accuracy, a composite operational amplifier is usually formed by combining a low temperature drift, low noise precision operational amplifier and a high voltage, high current power operational amplifier as an error amplifier, and then combined with a reference voltage, a sampling resistor and a differential sampling amplifier to form a current series negative feedback constant current circuit. This circuit has sufficient output accuracy in single-channel applications, but there are many practical problems when it is simply used in a multi-channel constant current drive system.

[0004] At present, there are two possible technical solutions for forming a multi-channel constant current drive system using the above constant current circuit:

[0005] The first solution is to combine the above-mentioned constant current circuit and its power supply module into a constant current drive module, and then form a multi-channel constant current drive system with multiple constant current drive modules. The advantage of this solution is that each constant current drive channel is independent of each other, and there is no crosstalk problem, but it requires the same number of power modules as the constant current drive channels, which is unacceptable in size and weight, and is expensive.

[0006] The second solution is to use only one power module that meets the maximum power demand, and distribute multiple constant current circuits on multiple identical constant current drive boards to form a multi-channel constant current drive system. The advantage of this solution is that it can effectively reduce volume, weight and cost, and conform to the modular design principle of aerospace electronic products. However, when multiple identical constant current drive boards are cascaded, the return paths of different constant current drive channels inevitably have a common path. When the driving current of one or several channels is large and flows through the common path, it will cause the reference potential of other channels to change, resulting in changes in the output current of other channels, that is, the crosstalk problem. Experiments have shown that the minimum crosstalk current introduced by this solution is greater than ±2mA, which is much greater than the design requirement value of ±0.4mA, and cannot meet current needs. Summary of the invention

[0007] The technology of the present invention solves the problem: overcomes the shortcomings of the prior art, provides a multi-channel high-precision constant current drive system and a design method for outputting crosstalk-free, effectively reduces the crosstalk current of the multi-channel constant current drive system, and at the same time has the advantages of small size, light weight, low cost, modularity, etc.

[0008] In order to solve the above technical problems, the present invention discloses a multi-channel high-precision constant current drive system with output crosstalk-free, comprising: L constant current drive boards and a power supply board; wherein the L constant current drive boards and the power supply board are cascaded through an internal electrical connector module to achieve structural and electrical connection; L is an integer greater than or equal to 1.

[0009] In the above-mentioned multi-channel high-precision constant current drive system with output crosstalk-free, L constant current drive boards are obtained by configuring L general constant current drive boards through different jumper modules.

[0010] In the above-mentioned multi-channel high-precision constant current drive system with no crosstalk output, the universal constant current drive board includes: M constant current drive circuits, a first inner electrical connector module, an outer electrical connector module and a jumper module; wherein M is an integer greater than or equal to 1;

[0011] M constant current drive circuits constitute M constant current output channels; wherein a single constant current drive circuit includes N ground signals with different network names, N being an integer greater than or equal to 1; M constant current drive circuits include: M×N ground signals with different network names, 2M power supply signals with different network names and M pairs of constant current output signals with different network names; the circuit structures of the constant current drive circuits are the same, and the ground signals included in the constant current drive circuits are independent of each other;

[0012] The first inner electrical connector module is used to realize the transmission of ground signals and power signals in M ​​constant current drive circuits, and realize the cascade between each constant current drive board and the power board; wherein the first inner electrical connector module includes X first inner electrical connectors, each of which includes x pins; the ground signals of M×N different network names are divided into L×M×N ground signals of different network names after passing through the jumper module, and are respectively connected to L×M×N different pins in the first inner electrical connector module; the power signals of 2M different network names are directly connected to 2M different pins in the first inner electrical connector module; X and x are both integers greater than or equal to 1, and X×x≥(L×M×N+2M);

[0013] An external electrical connector module is used to connect M external loads; wherein the external electrical connector module includes Y external electrical connectors, each of which includes y pins; M pairs of constant current output signals with different network names are respectively connected to 2M different pins of the external electrical connector module, and then connected to the M external loads; Y and y are both integers greater than or equal to 1, and Y×y≥M×2;

[0014] A jumper module is used to select and determine the return path of ground signals with M×N different network names in M ​​constant current drive circuits; wherein the jumper module includes L×M×N jumpers; each of the ground signals with M×N different network names is respectively connected to one end of the L jumpers in the jumper module, and is divided into L×M×N ground signals with different network names after passing through the L×M×N jumpers; the other ends of the L×M×N jumpers are respectively connected to L×M×N different pins in the first inner electrical connector module.

[0015] In the above-mentioned multi-channel high-precision constant current drive system with output crosstalk-free, the constant current drive circuit includes: a reference voltage module, a four-terminal sampling resistor, an error amplifier, a power amplifier and a sampling amplifier; wherein the output end of the reference voltage module is connected to the in-phase end of the error amplifier to set the current value of the constant current output; the output end of the error amplifier is connected to the input end of the power amplifier to form a series composite amplifier; the output end of the power amplifier serves as the positive end of the constant current output and is used to connect one end of the external load; the other end of the external load serves as the negative end of the constant current output and is simultaneously connected to the first current end of the four-terminal sampling resistor, and the second current end of the four-terminal sampling resistor is connected to the power ground; the two voltage ends of the four-terminal sampling resistor are respectively connected to the in-phase end and the inverting end of the sampling amplifier; the output end of the sampling amplifier is connected to the inverting end of the error amplifier to form a current series negative feedback constant current circuit.

[0016] In the above-mentioned multi-channel high-precision constant current drive system with output crosstalk-free, the power board includes: R power modules and a second inner electrical connector module, where R is an integer greater than or equal to 1;

[0017] R power supply modules are used to output m signal power supplies and n power supplies to supply power to L×M constant current drive circuits of L constant current drive boards; wherein m and n are both integers greater than or equal to 1, and m+n=2M;

[0018] The second inner electrical connector module is used to cooperate with the first inner electrical connector module to achieve cascading between the constant current drive boards and the power supply boards.

[0019] In the above-mentioned multi-channel high-precision constant current drive system with output crosstalk-free, decoupling capacitors are respectively provided at the output ends of the signal power supply and the power power supply; the ground ends of the decoupling capacitors serve as single-point grounding ends of the signal power supply and the power power supply respectively; the single-point grounding ends of the signal power supply and the power power supply are connected as the common grounding end of the system.

[0020] Correspondingly, the present invention also discloses a design method for a multi-channel high-precision constant current drive system with output crosstalk-free, comprising:

[0021] Step 1, determining the total number of channels T of the multi-channel high-precision constant current drive system with no crosstalk output, the total number L of constant current drive boards included in the multi-channel high-precision constant current drive system with no crosstalk output, and the total number M of constant current drive circuits included in a single constant current drive board; wherein L and M are both integers greater than or equal to 1, and T=L×M;

[0022] Step 2, designing a universal constant current drive board; wherein the universal constant current drive board comprises: M constant current drive circuits, a first inner electrical connector module, an outer electrical connector module and a jumper module;

[0023] Step 3, designing a power board; wherein the power board includes: R power modules and a second inner electrical connector module, where R is an integer greater than or equal to 1;

[0024] Step 4, configure the constant current driver board according to the designed universal constant current driver board;

[0025] Step 5, cascade the L constant current drive boards configured in step 4 and the power supply boards designed in step 3 through the first inner electrical connector module and the second inner electrical connector module to form a multi-channel high-precision constant current drive system with output crosstalk.

[0026] In the design method of the multi-channel high-precision constant current drive system with no output crosstalk, a universal constant current drive board is designed, including:

[0027] Determine the circuit structure of the constant current drive circuit; wherein the circuit structures of the constant current drive circuits are the same, and the ground signals included in the constant current drive circuits are independent of each other;

[0028] According to the determined circuit structure of the constant current driving circuit, the number of ground signals of different network names included in a single constant current driving circuit is determined to be N, and accordingly the number of ground signals of different network names included in M ​​constant current driving circuits is determined to be M×N; each of the ground signals of M×N different network names is respectively connected to one end of L jumpers in the jumper module, and the other ends of the L×M×N jumpers are respectively connected to L×M×N different pins in the first inner electrical connector module; accordingly, it is determined that the jumper module includes L×M×N jumpers, and the ground signals of M×N different network names are divided into L×M×N ground signals of different network names after passing through the L×M×N jumpers, and are respectively connected to L×M×N different pins in the first inner electrical connector module, and are named respectively; wherein N is an integer greater than or equal to 1;

[0029] According to the determined circuit structure of the constant current driving circuit, the total number of power signals with different network names included in the M constant current driving circuits is determined to be 2M; the power signals with the 2M different network names are directly connected to 2M different pins in the first inner electrical connector module respectively;

[0030] According to the total number of ground signals L×M×N and the total number of power signals 2M connected to the first inner electrical connector module, the minimum number of pins required for the first inner electrical connector module is determined to be L×M×N+2M, and the model, specification and quantity of the first inner electrical connector used to constitute the first inner electrical connector module are determined accordingly;

[0031] According to the total number M of constant current drive circuits included in the universal constant current drive board, the minimum number of pins required for the external electrical connector module is determined to be 2M, and the model specifications and quantity of the external electrical connector used to constitute the external electrical connector module are determined accordingly.

[0032] In the design method of the multi-channel high-precision constant current drive system with no output crosstalk, the power supply board is designed, including:

[0033] According to the total number 2M of power signals with different network names included in the M constant current drive circuits, the output requirements of the R power modules are determined, and a decoupling capacitor is set at each output end of the R power modules, and one end of the decoupling capacitor is used as a common ground terminal;

[0034] Based on the number of pins of the first inner electrical connector module and the signal definition of each pin, the model specifications and quantity of the second inner electrical connectors used to constitute the second inner electrical connector module are determined; wherein, the number of pins and the signal definition of each pin of each second inner electrical connector in the second inner electrical connector module are the same as those of each first inner electrical connector in the first inner electrical connector module.

[0035] In the design method of the multi-channel high-precision constant current drive system with no crosstalk output, the constant current drive board is configured according to the designed universal constant current drive board, including: numbering L universal constant current drive boards, and then short-circuiting M×N jumpers on universal constant current drive boards with different numbers respectively; wherein the basic principle of short-circuiting is: the jumper position numbers of the short-circuited jumpers on the universal constant current drive boards with different numbers are different, the total number of jumpers short-circuited on the universal constant current drive boards with different numbers is L×M×N, and corresponds to the jumper position number on a single universal constant current drive board one by one, so as to ensure that after the L constant current drive boards are cascaded, the ground signals of all L×M×N different network names of the L×M constant current drive circuits included in the L constant current drive boards are independently returned to the power supply board, and finally a single-point common ground is realized at the common ground terminal of the decoupling capacitor.

[0036] The present invention has the following advantages:

[0037] (1) The present invention discloses a multi-channel high-precision constant current drive system with no output crosstalk and a design method, which can ensure that when multiple constant current drive boards are cascaded and share a power supply board, all ground signals included in all constant current drive circuits can be independently returned to the decoupling capacitor grounding terminal of the power module output end through the internal electrical connector module, and finally a single-point common ground is achieved, thereby effectively solving the crosstalk problem existing in the multi-channel constant current drive output, and the effect is better than one order of magnitude.

[0038] (2) The present invention discloses a multi-channel high-precision constant current drive system with output crosstalk-free and a design method. A universal constant current drive board only needs one design state and can be set to a constant current drive board with different configuration states through a jumper. The constant current drive boards with different configuration states can be cascaded and combined in any order to form a multi-channel constant current drive system, while reducing the crosstalk problem. In addition, the universal constant current drive board complies with the modular design principle, can effectively reduce the design state, reduce maintenance costs, and facilitate mass production.

[0039] (3) The present invention discloses a multi-channel high-precision constant current drive system and design method with crosstalk-free output, which achieves the beneficial effect of multiple constant current drive boards or multiple constant current drive circuits sharing a set of power supplies while reducing crosstalk problems; in addition, multiple constant current drive boards sharing a set of power supplies can effectively reduce system volume, weight and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a block diagram of a multi-channel high-precision constant current drive system with output without crosstalk in an embodiment of the present invention;

[0041] Figure 2 1 is a circuit structure and working principle diagram of a first constant current driving circuit in an embodiment of the present invention;

[0042] Figure 3 1 is a circuit structure and working principle diagram of a second constant current driving circuit in an embodiment of the present invention;

[0043] Figure 4 1 is a circuit structure and working principle diagram of a third constant current driving circuit in an embodiment of the present invention;

[0044] Figure 5 1 is a circuit structure and working principle diagram of a fourth constant current driving circuit in an embodiment of the present invention;

[0045] Figure 6 It is a circuit structure and working principle diagram of a universal constant current drive board in an embodiment of the present invention;

[0046] Figure 7 is a configuration principle diagram of a first constant current drive board in an embodiment of the present invention;

[0047] Figure 8 is a configuration principle diagram of a second constant current drive board in an embodiment of the present invention;

[0048] Fig. 9 is a configuration principle diagram of a third constant current drive board in an embodiment of the present invention;

[0049] Fig.10 is a configuration principle diagram of a fourth constant current drive board in an embodiment of the present invention;

[0050] Fig.11 It is a schematic diagram of the signal definitions of each pin of the internal electrical connector J5 included in a power board card in an embodiment of the present invention;

[0051] Fig.12 The invention is a schematic diagram of the connection of all power supply signals and ground signals in a multi-channel high-precision constant current drive system with output without crosstalk in an embodiment of the invention. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0053] In this embodiment, the multi-channel high-precision constant current drive system with no crosstalk output includes: L constant current drive boards and a power supply board. The L constant current drive boards and the power supply board are cascaded through an internal electrical connector module to achieve structural and electrical connection; the L constant current drive boards are obtained by configuring L universal constant current drive boards through different jumper modules; and L is an integer greater than or equal to 1.

[0054] In this embodiment, the universal constant current drive board specifically includes: M constant current drive circuits, a first inner electrical connector module, an outer electrical connector module and a jumper module, wherein M is an integer greater than or equal to 1.

[0055] Preferably, M constant current drive circuits constitute M constant current output channels. A single constant current drive circuit includes N ground signals with different network names; M constant current drive circuits include: M×N ground signals with different network names, 2M power supply signals with different network names, and M pairs of constant current output signals with different network names. N is an integer greater than or equal to 1.

[0056] Furthermore, the circuit structures of each constant current drive circuit are the same, and the ground signals included in each constant current drive circuit are independent of each other. Specifically, the constant current drive circuit includes: a reference voltage module, a four-terminal sampling resistor, an error amplifier, a power amplifier and a sampling amplifier. Among them, the output end of the reference voltage module is connected to the in-phase end of the error amplifier, which is used to set the current value of the constant current output; the output end of the error amplifier is connected to the input end of the power amplifier to form a series composite amplifier, which provides a larger output voltage and current while ensuring the amplification accuracy; the output end of the power amplifier is used as the positive end of the constant current output, which is used to connect one end of the external load; the other end of the external load is used as the negative end of the constant current output, and is connected to the first current end of the four-terminal sampling resistor at the same time, and the second current end of the four-terminal sampling resistor is connected to the power ground; the two voltage ends of the four-terminal sampling resistor are respectively connected to the in-phase end and the inverting end of the sampling amplifier; the output end of the sampling amplifier is connected to the inverting end of the error amplifier to form a current series negative feedback constant current circuit.

[0057] Preferably, the first inner electrical connector module is used to realize the transmission of ground signals and power signals in M ​​constant current drive circuits, and realize the cascade between each constant current drive board and the power board. Wherein, the first inner electrical connector module includes X first inner electrical connectors, each first inner electrical connector includes x pins; the ground signals of M×N different network names are divided into L×M×N ground signals of different network names after passing through the jumper module, and are respectively connected to L×M×N different pins in the first inner electrical connector module; the power signals of 2M different network names are directly connected to 2M different pins in the first inner electrical connector module. X and x are both integers greater than or equal to 1, X×x≥(L×M×N+2M).

[0058] Preferably, the external electrical connector module is used to connect M external loads. The external electrical connector module includes Y external electrical connectors, each of which includes y pins; M pairs of constant current output signals with different network names are respectively connected to 2M different pins of the external electrical connector module, and then connected to the M external loads. Y and y are both integers greater than or equal to 1, and Y×y≥M×2.

[0059] Preferably, the jumper module is used to select and determine the return path of the ground signals of M×N different network names in the M constant current drive circuits. The jumper module includes L×M×N jumpers; each of the ground signals of M×N different network names is respectively connected to one end of the L jumpers in the jumper module, and is divided into L×M×N ground signals of different network names after passing through the L×M×N jumpers; the other ends of the L×M×N jumpers are respectively connected to L×M×N different pins in the first inner electrical connector module. The jumper can be a zero-ohm resistor or any other device that can be turned on and off.

[0060] In this embodiment, the power board may specifically include: R power modules and a second inner electrical connector module, where R is an integer greater than or equal to 1. The L×M constant current drive circuits share R power modules for power supply, and the power modules may be bipolar or unipolar output.

[0061] Preferably, R power supply modules are used to output m signal power supplies and n power supplies to power L×M constant current drive circuits of L constant current drive boards. Decoupling capacitors are provided at the output ends of the signal power supply and the power supply, respectively; the grounding ends of the decoupling capacitors serve as single-point grounding ends of the signal power supply and the power supply, respectively; the single-point grounding ends of the signal power supply and the power supply are connected as the common grounding end of the system. Both m and n are integers greater than or equal to 1, and m+n=2M.

[0062] Preferably, the second inner electrical connector module is used to cooperate with the first inner electrical connector module to realize the cascade between each constant current drive board and the power board. Further, the second inner electrical connector module has the same number of pins and signal definitions of each pin as the first inner electrical connector module, so as to ensure that when the cascade between each constant current drive board and the power board is realized through the second inner electrical connector module and the first inner electrical connector module, the pins with the same signal definition correspond one to one, that is: assuming that the second inner electrical connector module includes S second inner electrical connectors, each second inner electrical connector includes s pins, then: S×s=X×x≥(L×M×N+2M); S and s are both integers greater than or equal to 1.

[0063] On the basis of the above embodiments, the present invention further discloses a design method for a multi-channel high-precision constant current drive system with output crosstalk-free, comprising:

[0064] Step 1, determine the total number of channels T of the multi-channel high-precision constant current drive system with no crosstalk output, the total number L of constant current drive boards included in the multi-channel high-precision constant current drive system with no crosstalk output, and the total number M of constant current drive circuits included in a single constant current drive board. Wherein, T=L×M.

[0065] Step 2, designing a universal constant current drive board, wherein the universal constant current drive board comprises: M constant current drive circuits, a first inner electrical connector module, an outer electrical connector module and a jumper module.

[0066] In this embodiment, the specific design process of the universal constant current driver board is as follows:

[0067] The circuit structure of the constant current driving circuit is determined, wherein the circuit structures of the constant current driving circuits are the same, and the ground signals included in the constant current driving circuits are independent of each other.

[0068] According to the determined circuit structure of the constant current drive circuit, the number of ground signals of different network names included in a single constant current drive circuit is determined to be N, and accordingly the number of ground signals of different network names included in M ​​constant current drive circuits is determined to be M×N.

[0069] Each of the ground signals with M×N different network names is respectively connected to one end of the L jumpers in the jumper module, and the other ends of the L×M×N jumpers are respectively connected to L×M×N different pins in the first inner electrical connector module; accordingly, it is determined that the jumper module includes L×M×N jumpers, and the ground signals with M×N different network names are divided into L×M×N ground signals with different network names after passing through the L×M×N jumpers, and are respectively connected to L×M×N different pins in the first inner electrical connector module and named respectively.

[0070] According to the determined circuit structure of the constant current drive circuit, the total number of power signals with different network names included in the M constant current drive circuits is determined to be 2M; the power signals with 2M different network names are directly connected to 2M different pins in the first inner electrical connector module.

[0071] Based on the total number of ground signals L×M×N and the total number of power signals 2M connected to the first inner electrical connector module, the minimum number of pins required for the first inner electrical connector module is determined to be L×M×N+2M, and the model specifications and quantity of the first inner electrical connector used to constitute the first inner electrical connector module are determined accordingly.

[0072] According to the total number M of constant current drive circuits included in the universal constant current drive board, the minimum number of pins required for the external electrical connector module is determined to be 2M, and the model specifications and quantity of the external electrical connector used to constitute the external electrical connector module are determined accordingly.

[0073] Step 3, designing a power board, wherein the power board includes: R power modules and a second inner electrical connector module, where R is an integer greater than or equal to 1.

[0074] In this embodiment, the specific design process of the power board is as follows:

[0075] According to the total number 2M of power signals with different network names included in the M constant current drive circuits, the output requirements of R power modules are determined, and decoupling capacitors are set at each output end of the R power modules, and one end of the decoupling capacitor is used as a common ground terminal.

[0076] According to the number of pins of the first inner electrical connector module and the signal definition of each pin, the model specification and quantity of the second inner electrical connectors used to constitute the second inner electrical connector module are determined. The number of pins and the signal definition of each pin of each second inner electrical connector in the second inner electrical connector module are the same as those of each first inner electrical connector in the first inner electrical connector module.

[0077] Step 4: Configure the constant current driver board according to the designed universal constant current driver board.

[0078] In this embodiment, the specific configuration process of the constant current driver board is as follows: L universal constant current driver boards are numbered, and then the M×N jumpers on the universal constant current driver boards with different numbers are short-circuited respectively. Among them, the basic principle of short-circuiting is: the jumper position numbers of the short-circuited jumpers on the universal constant current driver boards with different numbers are different, and the total number of jumpers short-circuited on the universal constant current driver boards with different numbers is L×M×N, and corresponds to the jumper position number on the single universal constant current driver board one by one, so as to ensure that after the L constant current driver boards are cascaded, the ground signals of all L×M×N different network names of the L×M constant current drive circuits included in the L constant current driver boards are independently returned to the power supply board, and finally a single point common ground is realized at the common ground terminal of the decoupling capacitor.

[0079] Step 5, cascade the L constant current drive boards configured in step 4 and the power supply boards designed in step 3 through the first inner electrical connector module and the second inner electrical connector module to form a multi-channel high-precision constant current drive system with output crosstalk.

[0080] As can be seen from the above, for the multi-channel high-precision constant current drive system with no crosstalk output, there are: L constant current drive boards and power supply boards are cascaded to form a constant current drive system with L×M channels; each constant current drive board includes M constant current drive circuits, and the L constant current drive boards include L×M constant current drive circuits in total; the L×M constant current drive circuits include: L×M×N ground signals with different network names and L×M constant current output signals with different network names; the ground signals with L×M×N different network names are independently returned to the grounding end of the decoupling capacitor at the output end of the power module in the power supply board through the first inner electrical connector module and the second inner electrical connector module, and finally a single-point common ground is achieved. Furthermore, for a constant current drive board of M constant current drive circuits, there are: M×N ground signals with different network names include M×d signal grounds and M×d power grounds, N=2×d; 2M power supply signals with different network names include m signal power supplies and n power power supplies; the reference voltage module, the error amplifier and the sampling amplifier are powered by the signal power supply and return to the signal ground; the power amplifier is powered by the power power supply and return to the power ground.

[0081] Based on the above embodiment, a specific example (L=4, M=4, N=2, R=4) is used for explanation below.

[0082] like Figure 1 As shown, in this embodiment, the multi-channel high-precision constant current drive system with no output crosstalk includes: a first constant current drive board 101, a second constant current drive board 102, a third constant current drive board 103, a fourth constant current drive board 104 and a power supply board 105. Among them, the first constant current drive board 101, the second constant current drive board 102, the third constant current drive board 103, the fourth constant current drive board 104 and the power supply board 105 are cascaded through the internal electrical connector of the board to achieve structural and electrical connection.

[0083] In this embodiment, the first constant current drive board 101 includes: an inner electrical connector J1, an outer electrical connector X1 and four constant current drive circuits; the second constant current drive board 102 includes: an inner electrical connector J2, an outer electrical connector X2 and four constant current drive circuits; the third constant current drive board 103 includes: an inner electrical connector J3, an outer electrical connector X3 and four constant current drive circuits; the fourth constant current drive board 104 includes: an inner electrical connector J4, an outer electrical connector X4 and four constant current drive circuits; the power board 105 includes: an inner electrical connector J5, a first power module 106 and a second power module 107; the first power module 106 includes: a signal power module V1A and a power power module V2A; the second power module 107 includes: a signal power module V1B and a power power module V2B. Among them, the inner electrical connectors J1~J5 are used to realize the structure and electrical connection between multiple boards; the outer electrical connectors X1~X4 are used to connect external loads. The signal power module V1A, the power power module V2A, the signal power module V1B and the power power module V2B are used to supply power to the constant current drive circuits on the four constant current drive boards.

[0084] In this embodiment, the first constant current driver board 101, the second constant current driver board 102, the third constant current driver board 103 and the fourth constant current driver board 104 are respectively obtained by configuring the universal constant current driver board through different jumper modules. Wherein, each universal constant current driver board includes four constant current drive circuits, and the circuit structures of the four constant current drive circuits are the same, but the ground signals included are independent of each other.

[0085] Preferably, Figures 2 to 6As shown, each constant current drive circuit includes two ground signals with different network names, and the four constant current drive circuits include a total of 4×2=8 ground signals with different network names: signal ground GND1-1A, power ground GND2-1A, signal ground GND1-1B, power ground GND2-1B, signal ground GND1-2A, power ground GND2-2A, signal ground GND1-2B, and power ground GND2-2B.Each of the above 8 ground signals is connected to one end of 4 different jumpers, and the other ends of the jumpers are connected to 4 different pins of the internal electrical connector JX (X=1, 2, 3, 4), and are named respectively. Specifically, the signal ground GND1-1A is simultaneously connected to the 1st pin of the 4 jumpers P1-1A-1 to P1-1A-4, and the 2nd pins of P1-1A-1 to P1-1A-4 are respectively connected to the 3rd to 6th pins of the internal electrical connector JX, and are named GND1-1A-1 to GND1-1A-4; the signal ground GND1-1B is simultaneously connected to the 1st pin of the 4 jumpers P1-1B-1 to P1-1B-4, and the 2nd pins of P1-1A-1 to P1-1A-4 are respectively connected to the 3rd to 6th pins of the internal electrical connector JX, and are named GND1-1A-1 to GND1-1A-4. The second pin of P1-1B-4 is connected to the 7th to 10th pins of the internal electrical connector JX, and are named GND1-1B-1 to GND1-1B-4 respectively; the signal ground GND1-2A is simultaneously connected to the 1st pins of the four jumpers P1-2A-1 to P1-2A-4, and the second pins of P1-2A-1 to P1-2A-4 are respectively connected to the 11th to 14th pins of the internal electrical connector JX, and are named GND1-2A-1 to GND1-2A-4 respectively; the signal ground GND1-2B is simultaneously connected to the 1st pins of the four jumpers P1-2B-1 to P1-2B-4, and the second pins of P1-2B-1 to P1-2B-4 are respectively connected to the internal electrical connector The power ground GND2-1A is connected to the 15th to 18th pins of the four jumpers P2-1A-1 to P2-1A-4, and the 2nd pins of P2-1A-1 to P2-1A-4 are connected to the 23rd to 26th pins of the internal electrical connector JX, and are named GND2-1A-1 to GND2-1A-4 respectively; the power ground GND2-1B is connected to the 1st pins of the four jumpers P2-1B-1 to P2-1B-4, and the 2nd pins of P2-1B-1 to P2-1B-4 are connected to the 27th to 30th pins of the internal electrical connector JX, and are named GND2-1A-1 to GND2-1A-4 respectively. GND2-1B-1 to GND2-1B-4; the power ground GND2-2A is connected to the 1st pin of the four jumpers P2-2A-1 to P2-2A-4, and the 2nd pins of P2-2A-1 to P2-2A-4 are respectively connected to the 31st to 34th pins of the internal electrical connector JX, and are named GND2-2A-1 to GND2-2A-4 respectively; the power ground GND2-2B is connected to the 1st pin of the four jumpers P2-2B-1 to P2-2B-4, and the 2nd pins of P2-2B-1 to P2-2B-4 are respectively connected to the 35th to 38th pins of the internal electrical connector JX, and are named GND2-2B-1 to GND2-2B-4 respectively.In this way, the eight ground signals with different network names included in the four constant current drive circuits are divided into 32 ground signals with different network names after passing through 32 jumpers, and are respectively connected to 32 different pins of the internal electrical connector JX.

[0086] Preferably, Figures 2 to 6 As shown, the four constant current drive circuits include 4 pairs of power signals with a total of 8 different network names: power signal +V1-A, power signal -V1-A, power signal +V1-B, power signal -V1-B, power signal +V2-A, power signal -V2-A, power signal +V2-B and power signal -V2-B. Among them, power signal +V1-A and power signal -V1-A are bipolar signal power supplies, provided by signal power module V1A; power signal +V2-A and power signal -V2-A are bipolar power supplies, provided by power supply module V2A; power signal +V1-B and power signal -V1-B are bipolar signal power supplies, provided by signal power module V1B; power signal +V2-B and power signal -V2-B are bipolar power supplies, provided by power supply module V2B. The above 8 power signals with different network names are directly connected to 8 different pins of the internal electrical connector JX.

[0087] Preferably, Figures 2 to 6 As shown, the four constant current drive circuits include 4 pairs of constant current output signals with different network names, which are used to connect 4 external loads respectively. The 4 pairs of constant current output signals with a total of 8 different network names are specifically: constant current output signal IL-1A+, constant current output signal IL-1A-, constant current output signal IL-1B+, constant current output signal IL-1B-, constant current output signal IL-2A+, constant current output signal IL-2A-, constant current output signal IL-2B+ and constant current output signal IL-2B-.

[0088] Preferably, Figures 2 to 6 As shown, the first constant current drive circuit includes: a reference voltage module VREF-1A, a four-terminal sampling resistor R1A, an error amplifier A1-1A, a power amplifier A3-1A and a sampling amplifier A2-1A; the second constant current drive circuit includes: a reference voltage module VREF-1B, a four-terminal sampling resistor R2B, an error amplifier A1-1B, a power amplifier A3-1B and a sampling amplifier A2-1B; the third constant current drive circuit includes: a reference voltage module VREF-2A, a four-terminal sampling resistor R2A, an error amplifier A1-2A, a power amplifier A3-2A and a sampling amplifier A2-2A; the fourth constant current drive circuit includes: a reference voltage module VREF-2B, a four-terminal sampling resistor R2B, an error amplifier A1-2B, a power amplifier A3-2B and a sampling amplifier A2-2B.

[0089] Preferably, the circuit structure and working principle of the four constant current drive circuits are the same. Figure 2 (The first constant current drive circuit) is taken as an example to specifically introduce the connection method and basic principle of the constant current drive circuit: the output end of the reference voltage module VREF-1A is connected to the in-phase end of the error amplifier A1-1A, which is used to set the current value of the constant current output; the output end of the error amplifier A1-1A is connected to the input end of the power amplifier A3-1A to form a series composite amplifier, which provides a larger output voltage and current while ensuring the amplification accuracy; the output end of the power amplifier A3-1A serves as the constant current output positive end IL-1A+, which is used to connect one end of the external load; the other end of the external load serves as the constant current output negative end IL-1A-, and is connected to the first current end of the four-terminal sampling resistor R1A, and the second current end of the four-terminal sampling resistor R1A is connected to the power ground GND2-1A; the two voltage ends of the four-terminal sampling resistor R1A are respectively connected to the in-phase end and the inverting end of the sampling amplifier A2-1A; the output end of the sampling amplifier A2-1A is connected to the inverting end of the error amplifier A1-1A to form a current series negative feedback constant current circuit. The error amplifier A1-1A and the sampling amplifier A2-1A are powered by +V1-A and -V1-A, and return to the signal ground GND1-1A; the power amplifier A3-1A is powered by +V2-A and -V2-A, and return to the power ground GND2-1A. The signal ground GND1-1A and the power ground GND2-1A are independently returned to the decoupling capacitor grounding terminal of the signal power module V1A and the power power module V2A through the jumper and the internal electrical connector, respectively, and finally a single-point common ground is achieved, thereby effectively reducing the interference of the power signal on the precision amplification and sampling signal, and improving the output current stability. Assuming that the voltage value of the reference voltage module VREF-1A is V, the resistance value of the four-terminal sampling resistor R1A is R, and the gain of the sampling amplifier A2-1A is G, the output current IL=V / (R×G).

[0090] In this embodiment, as mentioned above, the first constant current driver card 101, the second constant current driver card 102, the third constant current driver card 103 and the fourth constant current driver card 104 are respectively obtained by configuring the universal constant current driver card through different jumper modules. Figures 7 to 10 Specific description of the jumper configuration of the universal constant current driver board:

[0091] Figure 7 It is a schematic diagram of jumper configuration of the first constant current driver board 101. Figure 7In the circuit, 8 jumpers need to be shorted: jumper P1-1A-1, jumper P1-1B-1, jumper P1-2A-1, jumper P1-2B-1, jumper P2-1A-1, jumper P2-1B-1, jumper P2-2A-1 and jumper P2-2B-1. After shorting the above jumpers, the ground signals GND1-1A, GND1-1B, GND1-2A, GND1-2B, GND2-1A, GND2-1B, GND2-2A and GND2-2B with different network names included in the four constant current drive circuits are independently connected to the 3, 7, 11, 15, 23, 27, 31 and 35 pins of the inner electrical connector J1.

[0092] Figure 8 1 is a schematic diagram of the jumper configuration of the second constant current driver board 102. Figure 8 In the circuit, 8 jumpers need to be shorted: jumper P1-1A-2, jumper P1-1B-2, jumper P1-2A-2, jumper P1-2B-2, jumper P2-1A-2, jumper P2-1B-2, jumper P2-2A-2 and jumper P2-2B-2. After shorting the above jumpers, the ground signals GND1-1A, GND1-1B, GND1-2A, GND1-2B, GND2-1A, GND2-1B, GND2-2A and GND2-2B with 8 different network names included in the four constant current drive circuits are independently connected to the 4th, 8th, 12th, 16th, 24th, 28th, 32nd and 36th pins of the inner electrical connector J2.

[0093] Fig. 9 It is a schematic diagram of jumper configuration of the third constant current driver board 103. Fig. 9 In the circuit, 8 jumpers need to be shorted: jumper P1-1A-3, jumper P1-1B-3, jumper P1-2A-3, jumper P1-2B-3, jumper P2-1A-3, jumper P2-1B-3, jumper P2-2A-3 and jumper P2-2B-3. After shorting the above jumpers, the ground signals GND1-1A, GND1-1B, GND1-2A, GND1-2B, GND2-1A, GND2-1B, GND2-2A and GND2-2B with different network names included in the four constant current drive circuits are independently connected to the 5th, 9th, 13th, 17th, 25th, 29th, 33rd and 37th pins of the inner electrical connector J3.

[0094] Fig.10 4 is a schematic diagram of jumper configuration of the fourth constant current driver board 104. Fig.10In the circuit, 8 jumpers need to be shorted: jumper P1-1A-4, jumper P1-1B-4, jumper P1-2A-4, jumper P1-2B-4, jumper P2-1A-4, jumper P2-1B-4, jumper P2-2A-4 and jumper P2-2B-4. After shorting the above jumpers, the ground signals GND1-1A, GND1-1B, GND1-2A, GND1-2B, GND2-1A, GND2-1B, GND2-2A and GND2-2B with 8 different network names included in the four constant current drive circuits are independently connected to the 6th, 10th, 14th, 18th, 26th, 30th, 34th and 38th pins of the inner electrical connector J3.

[0095] In this embodiment, if Fig.11 , is a schematic diagram of the pin definitions of the internal electrical connector J5 included in the power board 105. To ensure that the four constant current drive boards and the power board can be cascaded, and that after the cascade, all ground signals of different network names included in the four constant current drive boards are independently returned to the ground terminal of the decoupling capacitor at the output end of the power module of the power board through the internal electrical connector, it is required that the internal electrical connector J5 included in the power board and the internal electrical connector JX included in the constant current drive board have the same model and pin definition.

[0096] In this embodiment, the four constant current drive boards are composed of four universal constant current drive boards. Figures 7 to 10 After cascading, the ground signals of all 16 constant current drive circuits with 32 different network names included in the four constant current drive boards are independently returned to the ground terminal of the decoupling capacitor at the output end of the power module through the internal electrical connector, and finally a single point common ground is achieved, thereby effectively reducing the crosstalk problem. Fig.12 The connection relationship of the above ground signals is described in detail:

[0097] Fig.12In the circuit, the eight signal grounds GND1-1A-1, GND1-1A-2, GND1-1A-3, GND1-1A-4, GND1-2A-1, GND1-2A-2, GND1-2A-3 and GND1-2A-4 included in the four constant current drive boards are independently returned to the common ground terminal A of the decoupling capacitors C1 and C2 at the output end of the signal power module V1A through pins 3 to 6 and pins 11 to 14 on the internal electrical connector J5, realizing single-point common grounding. All eight signal grounds GND1-1B-1, GND1-1B-2, GND1-1B-3, GND1-1B-4 and GND1-2B-1, GND1-2B-2, GND1-2B-3 and GND1-2B-4 included in the four constant current driver boards are independently returned to the common ground terminal B of the decoupling capacitors C5 and C6 at the output end of the signal power module V1B through pins 7 to 10 and pins 15 to 18 on the internal electrical connector J5, realizing single-point common grounding. The eight power grounds GND2-1A-1, GND2-1A-2, GND2-1A-3, GND2-1A-4 and GND2-2A-1, GND2-2A-2, GND2-2A-3 and GND2-2A-4 included in the four constant current drive boards are independently returned to the common ground terminal B of the decoupling capacitors C3 and C4 at the output end of the power supply module V2A through pins 23 to 26 and pins 31 to 34 on the internal electrical connector J5, realizing single-point common grounding. The eight power grounds GND2-1B-1, GND2-1B-2, GND2-1B-3, GND2-1B-4 and GND2-2B-1, GND2-2B-2, GND2-2B-3 and GND2-2B-4 included in the four constant current driver boards are independently returned to the common ground terminal D of the decoupling capacitors C7 and C8 at the output end of the power supply module V2B through the 27 to 30 pins and 35 to 38 pins on the internal electrical connector J5, realizing single-point common ground. Finally, the common ground terminals A, B, C and D of the signal power module V1A, signal power module V1B, power power module V2A and power power module V2B are connected, and finally all ground signals are single-point common ground. The advantage of the above-mentioned ground signal distribution method is that it can effectively reduce the crosstalk current between different channels. In the embodiment provided by the present invention, when any channel outputs a maximum current of 2.5A, the maximum crosstalk current to any other channel is only 0.2mA, which is more than an order of magnitude lower than the minimum crosstalk current of 2mA in the traditional solution.

[0098] Fig.12 In the example, four constant current drive boards and power supply boards are Figure 1After the cascade shown, the constant current drive circuits included in the four constant current drive boards are powered by +V1-A, -V1-A, +V1-B, -V1-B, +V2-A, -V2-A, +V1-B and -V1-B. Among them, +V1-A and -V1-A are provided by the signal power module V1A, and are respectively connected to the 1st and 2nd pins of the internal electrical connectors J1 to J5; +V1-B and -V1-B are provided by the signal power module V1B, and are respectively connected to the 19th and 20th pins of the internal electrical connectors J1 to J5; +V2-A and -V2-A are provided by the power supply module V2A, and are respectively connected to the 21st and 22nd pins of the internal electrical connectors J1 to J5; +V2-B and -V2-B are provided by the power supply module V2B, and are respectively connected to the 39th and 40th pins of the internal electrical connectors J1 to J5. The advantage of the above power supply method is that it can reduce the number of power modules required, thereby reducing system volume, weight and cost.

[0099] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0100] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A multi-channel high-precision constant current drive system with no crosstalk output, characterized in that: include: L constant current drive boards and one power supply board; wherein the L constant current drive boards and one power supply board are cascaded through an internal electrical connector module to achieve structural and electrical connection; L is an integer greater than or equal to 1.

2. The multi-channel high-precision constant current drive system with output crosstalk-free according to claim 1, characterized in that: L constant current driver boards are obtained by configuring L universal constant current driver boards through different jumper modules.

3. The multi-channel high-precision constant current drive system with output crosstalk-free according to claim 2, characterized in that: A universal constant current drive board, comprising: M constant current drive circuits, a first inner electrical connector module, an outer electrical connector module and a jumper module; wherein M is an integer greater than or equal to 1; M constant current drive circuits constitute M constant current output channels; wherein a single constant current drive circuit includes N ground signals with different network names, N being an integer greater than or equal to 1; M constant current drive circuits include: M×N ground signals with different network names, 2M power supply signals with different network names and M pairs of constant current output signals with different network names; the circuit structures of the constant current drive circuits are the same, and the ground signals included in the constant current drive circuits are independent of each other; The first inner electrical connector module is used to realize the transmission of ground signals and power signals in M ​​constant current drive circuits, and realize the cascade between each constant current drive board and the power board; wherein the first inner electrical connector module includes X first inner electrical connectors, each of which includes x pins; the ground signals of M×N different network names are divided into L×M×N ground signals of different network names after passing through the jumper module, and are respectively connected to L×M×N different pins in the first inner electrical connector module; the power signals of 2M different network names are directly connected to 2M different pins in the first inner electrical connector module; X and x are both integers greater than or equal to 1, and X×x≥(L×M×N+2M); An external electrical connector module is used to connect M external loads; wherein the external electrical connector module includes Y external electrical connectors, each of which includes y pins; M pairs of constant current output signals with different network names are respectively connected to 2M different pins of the external electrical connector module, and then connected to the M external loads; Y and y are both integers greater than or equal to 1, and Y×y≥M×2; A jumper module is used to select and determine the return path of ground signals with M×N different network names in M ​​constant current drive circuits; wherein the jumper module includes L×M×N jumpers; each of the ground signals with M×N different network names is respectively connected to one end of the L jumpers in the jumper module, and is divided into L×M×N ground signals with different network names after passing through the L×M×N jumpers; the other ends of the L×M×N jumpers are respectively connected to L×M×N different pins in the first inner electrical connector module.

4. The multi-channel high-precision constant current drive system with output crosstalk-free according to claim 3, characterized in that: A constant current driving circuit comprises: a reference voltage module, a four-terminal sampling resistor, an error amplifier, a power amplifier and a sampling amplifier; wherein the output end of the reference voltage module is connected to the in-phase end of the error amplifier to set the current value of the constant current output; the output end of the error amplifier is connected to the input end of the power amplifier to form a series composite amplifier; the output end of the power amplifier is used as a constant current output positive end to connect one end of an external load; the other end of the external load is used as a constant current output negative end and is simultaneously connected to the first current end of the four-terminal sampling resistor, and the second current end of the four-terminal sampling resistor is connected to a power ground; the two voltage ends of the four-terminal sampling resistor are respectively connected to the in-phase end and the inverting end of the sampling amplifier; the output end of the sampling amplifier is connected to the inverting end of the error amplifier to form a current series negative feedback constant current circuit.

5. The multi-channel high-precision constant current drive system with output crosstalk-free according to claim 4, characterized in that: The power board includes: R power modules and a second inner electrical connector module, where R is an integer greater than or equal to 1; R power supply modules are used to output m signal power supplies and n power supplies to supply power to L×M constant current drive circuits of L constant current drive boards; wherein m and n are both integers greater than or equal to 1, and m+n=2M; The second inner electrical connector module is used to cooperate with the first inner electrical connector module to achieve cascading between the constant current drive boards and the power supply boards.

6. The multi-channel high-precision constant current drive system with output crosstalk-free according to claim 5, characterized in that: The output ends of the signal power supply and the power power supply are respectively provided with decoupling capacitors; the grounding ends of the decoupling capacitors are respectively used as single-point grounding ends of the signal power supply and the power power supply; the single-point grounding ends of the signal power supply and the power power supply are connected as the system common grounding end.

7. A design method for a multi-channel high-precision constant current drive system with no crosstalk output, characterized in that: include: Step 1, determining the total number of channels T of the multi-channel high-precision constant current drive system with no crosstalk output, the total number L of constant current drive boards included in the multi-channel high-precision constant current drive system with no crosstalk output, and the total number M of constant current drive circuits included in a single constant current drive board; wherein L and M are both integers greater than or equal to 1, and T=L×M; Step 2, designing a universal constant current drive board; wherein the universal constant current drive board comprises: M constant current drive circuits, a first inner electrical connector module, an outer electrical connector module and a jumper module; Step 3, designing a power board; wherein the power board includes: R power modules and a second inner electrical connector module, where R is an integer greater than or equal to 1; Step 4, configure the constant current driver board according to the designed universal constant current driver board; Step 5, cascade the L constant current drive boards configured in step 4 and the power supply boards designed in step 3 through the first inner electrical connector module and the second inner electrical connector module to form a multi-channel high-precision constant current drive system with output crosstalk.

8. The design method of a multi-channel high-precision constant current drive system with output crosstalk-free according to claim 7, characterized in that: Design a universal constant current driver board, including: Determine the circuit structure of the constant current drive circuit; wherein the circuit structures of the constant current drive circuits are the same, and the ground signals included in the constant current drive circuits are independent of each other; According to the determined circuit structure of the constant current driving circuit, the number of ground signals of different network names included in a single constant current driving circuit is determined to be N, and accordingly the number of ground signals of different network names included in M ​​constant current driving circuits is determined to be M×N; each of the ground signals of M×N different network names is respectively connected to one end of L jumpers in the jumper module, and the other ends of the L×M×N jumpers are respectively connected to L×M×N different pins in the first inner electrical connector module; accordingly, it is determined that the jumper module includes L×M×N jumpers, and the ground signals of M×N different network names are divided into L×M×N ground signals of different network names after passing through the L×M×N jumpers, and are respectively connected to L×M×N different pins in the first inner electrical connector module, and are named respectively; wherein N is an integer greater than or equal to 1; According to the determined circuit structure of the constant current driving circuit, the total number of power signals with different network names included in the M constant current driving circuits is determined to be 2M; the power signals with the 2M different network names are directly connected to 2M different pins in the first inner electrical connector module respectively; According to the total number of ground signals L×M×N and the total number of power signals 2M connected to the first inner electrical connector module, the minimum number of pins required for the first inner electrical connector module is determined to be L×M×N+2M, and the model, specification and quantity of the first inner electrical connector used to constitute the first inner electrical connector module are determined accordingly; According to the total number M of constant current drive circuits included in the universal constant current drive board, the minimum number of pins required for the external electrical connector module is determined to be 2M, and the model specifications and quantity of the external electrical connector used to constitute the external electrical connector module are determined accordingly.

9. The design method of a multi-channel high-precision constant current drive system with output crosstalk-free according to claim 8, characterized in that: Design of power supply boards, including: According to the total number 2M of power signals with different network names included in the M constant current drive circuits, the output requirements of the R power modules are determined, and a decoupling capacitor is set at each output end of the R power modules, and one end of the decoupling capacitor is used as a common ground terminal; Based on the number of pins of the first inner electrical connector module and the signal definition of each pin, the model specifications and quantity of the second inner electrical connectors used to constitute the second inner electrical connector module are determined; wherein, the number of pins and the signal definition of each pin of each second inner electrical connector in the second inner electrical connector module are the same as those of each first inner electrical connector in the first inner electrical connector module.

10. The design method of a multi-channel high-precision constant current drive system with output crosstalk-free according to claim 9, characterized in that: According to the designed universal constant current drive board, the constant current drive board is configured, including: numbering L universal constant current drive boards, and then short-circuiting M×N jumpers on universal constant current drive boards with different numbers respectively; wherein the basic principle of short-circuiting is: the position numbers of the short-circuited jumpers on the universal constant current drive boards with different numbers are different, the total number of the short-circuited jumpers on the universal constant current drive boards with different numbers is L×M×N, and they correspond to the position numbers of the jumpers on a single universal constant current drive board one by one, so as to ensure that after the L constant current drive boards are cascaded, the ground signals of all L×M×N different network names of the L×M constant current drive circuits included in the L constant current drive boards are independently returned to the power supply board, and finally a single-point common ground is realized at the common ground terminal of the decoupling capacitor.

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