A voltage current adaptive sampling system and servo valve

Abstract

This invention discloses a voltage and current adaptive sampling system and a servo valve, relating to the field of servo valve technology. The voltage and current adaptive sampling system includes: a voltage and current determination unit that receives an input electrical signal and determines whether the signal is a current signal or a voltage signal; a voltage and current conversion unit that converts the current signal into a voltage signal; a positive and negative voltage adjustment unit that detects the voltage signal conducted by the voltage and current conversion unit and converts the detected negative voltage signal into a positive voltage signal; and an overvoltage adjustment unit that compares the positive voltage signal with a first preset threshold and adjusts positive voltage signals exceeding the first preset threshold to within the first preset threshold range in a preset manner. This design enables the acquisition of multiple signals, including voltage and / or current, and the internal resistance of each adjustment unit is precisely controllable, ensuring the accuracy of the acquired information and enhancing the adaptive capability of the voltage and current adaptive sampling system.

Description

Technical Field

[0001] This invention relates to the field of servo valve technology, and in particular to a voltage and current adaptive sampling system and a servo valve. Background Technology

[0002] Servo valves are key electro-hydraulic control components widely used in aerospace, machinery manufacturing, and industrial automation. They convert electrical signals into hydraulic outputs, enabling precise control of position, speed, and current. The performance of a servo valve directly affects the accuracy and response speed of the entire control system.

[0003] A servo valve comprises a sampling system, a control system, and a mechanical structure. The sampling system is a crucial component of a servo valve, and its performance directly impacts the overall performance of the valve. As industries place increasingly stringent demands on product performance, accuracy, and ease of use, sampling systems require more advanced functionalities.

[0004] Currently, most servo valve sampling methods generally suffer from the following problems: Single sampling signal: The sampling system can only sample a specific type of signal. If it is necessary to sample voltage and current signals at the same time, separate voltage sampling channels and current sampling channels need to be set up.

[0005] Poor reliability of the sampling system: The sampling system uses a general-purpose sampling chip or the analog-to-digital converter built into the controller, resulting in poor sampling accuracy.

[0006] The sampling system has poor adaptability: it can only sample signal values ​​within a specific amplitude range.

[0007] The above problems have resulted in the servo valve's performance, such as accuracy and convenience, failing to meet the needs of technological development, which has severely restricted the development of servo valves and even precision transmission technology. Summary of the Invention

[0008] The main objective of this invention is to propose a voltage and current adaptive sampling system and a servo valve, aiming to improve the ease of use and sampling accuracy of the servo valve sampling system.

[0009] To achieve the above objectives, the present invention proposes a voltage and current adaptive sampling system, comprising a voltage and current determination unit, a voltage and current conversion unit, a positive and negative voltage adjustment unit, an overvoltage adjustment unit, and an AD sampling unit connected in sequence. The voltage and current determination unit receives the input electrical signal and determines whether the electrical signal is a current signal or a voltage signal. The voltage-to-current conversion unit turns on a voltage signal, intercepts a current signal, and converts the current signal into a voltage signal. The positive and negative voltage adjustment unit detects the voltage signal turned on by the voltage-current conversion unit, converts the detected negative voltage signal into a positive voltage signal, and turns on the positive voltage signal. The overvoltage regulation unit compares the positive voltage signal turned on by the positive and negative voltage regulation unit with a first preset threshold, adjusts the positive voltage signal exceeding the first preset threshold to the range of the first preset threshold in a preset manner, and turns on the positive voltage signal within the range of the first preset threshold.

[0010] In one embodiment, the voltage and current determination unit includes a voltage and current detection circuit, at least one analog switch circuit, and a first flag bit manager. The output terminal of the voltage and current detection circuit is connected to the input terminal of the first flag bit manager. After the voltage and current detection circuit detects the input electrical signal, it judges the voltage signal and current signal of the electrical signal and transmits the judgment result to the first flag bit manager. The output terminal of the first flag bit manager is connected to the input terminal of different analog switch circuits respectively. Based on the judgment result, the first flag bit manager controls the different analog switch circuits to turn on and off respectively, thereby conducting the corresponding voltage signal or current signal.

[0011] In one embodiment, the number of analog switch circuits is two, corresponding to a voltage signal analog switch and a current signal analog switch, respectively; When the voltage and current detection circuit detects that the input signal is a voltage signal, the first flag manager controls the current signal analog switch to open and the voltage signal analog switch to close. When the voltage and current detection circuit detects that the input signal is a current signal, the first flag manager controls the voltage signal analog switch to open and the current signal analog switch to close.

[0012] In one embodiment, the voltage-to-current conversion unit includes a first operational scaling circuit and a high-precision resistor; The current signal flows into the high-precision resistor in the voltage-to-current conversion unit and is converted into a voltage signal. The converted voltage signal is reduced or amplified by the first operational scaling circuit based on a preset factor. Alternatively, the current signal flows into the first operational scaling circuit in the voltage-to-current conversion unit and is reduced or amplified based on a preset factor. The reduced or amplified current signal then flows into the high-precision resistor and is converted into a corresponding voltage signal.

[0013] In one embodiment, the resistance value of the high-precision resistor in the voltage-to-current conversion unit is a positive integer, and the first operational scaling circuit is a buck circuit.

[0014] In one embodiment, the positive and negative voltage regulation unit includes a negative voltage determination unit, a negative voltage adjustment circuit, and a first filter circuit connected in sequence. The negative voltage determination unit determines whether the voltage output by the voltage-current conversion unit is a positive or negative voltage signal; The negative voltage adjustment circuit boosts the overall voltage signal that is determined to have a negative voltage signal. The first filter circuit filters out noise signals from the boosted voltage signal.

[0015] In one embodiment, the overvoltage regulation unit includes a voltage determination unit, a second operational scaling circuit, and a second filtering circuit connected in sequence. The voltage determination unit compares the voltage signal output by the positive and negative voltage adjustment unit with a second preset threshold to make a judgment; The second operational scaling circuit scales the voltage signal that exceeds the second preset threshold proportionally, so that the scaled voltage signal meets the second preset threshold. The second filter circuit filters out noise signals from the proportionally scaled voltage signal.

[0016] In one embodiment, the second operational scaling circuit is an isolation circuit used to isolate the voltage signal output by the positive and negative voltage adjustment unit into multiple scaling circuits, and to perform the same or different scaling on the voltage signal on each individual circuit.

[0017] In one embodiment, the AD sampling unit is a single-channel sampling unit, including a high-precision AD sampling circuit and a protection circuit.

[0018] The present invention also proposes a servo valve, including a servo valve body and a voltage and current adaptive sampling system as described above, wherein the voltage and current adaptive sampling system can simultaneously sample voltage signals and current signals. The technical solution of this invention employs a voltage and current determination unit to conduct voltage signals and intercept current signals, and a voltage-current conversion unit to convert the intercepted current signals into voltage signals. Based on the positive and negative voltage adjustment unit, the negative voltage of the passed voltage signals is boosted so that the voltages after passing are all positive voltages. Then, the overvoltage adjustment unit reduces the voltage exceeding the threshold to the threshold range, and finally transmits it to the AD sampling unit for acquisition. This design realizes the acquisition of multiple signals such as voltage and / or current, and the internal resistance of each adjustment unit is controllable, ensuring the accuracy of the acquired information and enhancing the adaptive capability of the voltage and current adaptive sampling system. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the voltage and current adaptive sampling system provided by the present invention; Figure 2 A partial structural diagram of an embodiment of the voltage and current adaptive sampling system provided by the present invention. Figure 1 ; Figure 3 A partial structural diagram of an embodiment of the voltage and current adaptive sampling system provided by the present invention. Figure 2 ; Figure 4 A partial structural diagram of an embodiment of the voltage and current adaptive sampling system provided by the present invention. Figure 3 ; Figure 5 This is a schematic diagram of a servo valve embodiment provided by the present invention.

[0021] Explanation of icon numbers: 1. Voltage and current adaptive sampling system; 2. Servo valve; 11. Voltage and current determination unit; 12. Voltage and current conversion unit; 13. Positive and negative voltage adjustment unit; 14. Overvoltage adjustment unit; 15. AD sampling unit; 21. Servo valve body; 111. Voltage and current detection circuit; 112. First flag manager; 113. Analog switch circuit; 131. Negative voltage determination unit; 132. Negative voltage adjustment circuit; 133. First filter circuit; 141. Voltage determination unit; 142. Second operational scaling circuit; 143. Second filter circuit. The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] It should be noted that if directional indicators (such as up, down, left, right, front, back, etc.) are involved in the embodiments of this invention, these directional indicators are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0024] Furthermore, if the embodiments of the present invention involve descriptions using terms such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Furthermore, the use of "and / or" or "and / or" throughout the text includes three parallel options; for example, "A and / or B" includes option A, option B, or options where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] Servo valves are key electro-hydraulic control components widely used in aerospace, machinery manufacturing, and industrial automation. They convert electrical signals into hydraulic outputs, enabling precise control of position, speed, and current. The performance of a servo valve directly affects the accuracy and response speed of the entire control system. A servo valve comprises a sampling system, a control system, and a mechanical structure. The sampling system is a crucial component of the servo valve, and its performance directly impacts the overall performance of the servo valve. As industries place increasingly stringent demands on product performance, accuracy, and ease of use, sampling systems require even more advanced capabilities.

[0026] Currently, most servo valve sampling methods generally suffer from the following problems: Single sampling signal: The sampling system can only sample a specific type of signal. If it is necessary to sample voltage and current signals at the same time, separate voltage sampling channels and current sampling channels need to be set up.

[0027] Poor reliability of the sampling system: The sampling system uses a general-purpose sampling chip or the analog-to-digital converter built into the controller, resulting in poor sampling accuracy.

[0028] The sampling system has poor adaptability: it can only sample signal values ​​within a specific amplitude range.

[0029] The above problems have resulted in the servo valve's performance, such as accuracy and convenience, failing to meet the needs of technological development, which has severely restricted the development of servo valves and even precision transmission technology.

[0030] Please combine Figure 1 and Figure 2 The present invention proposes a voltage and current adaptive sampling system 1, which includes a voltage and current determination unit 11, a voltage and current conversion unit 12, a positive and negative voltage adjustment unit 13, an overvoltage adjustment unit 14 and an AD sampling unit 15 connected in sequence. The voltage and current determination unit 11 receives the input electrical signal and determines whether the electrical signal is a current signal or a voltage signal; The voltage-to-current conversion unit 12 turns on the voltage signal, intercepts the current signal, and converts the current signal into a voltage signal; The positive and negative voltage adjustment unit 13 detects the voltage signal turned on by the voltage-current conversion unit 12, converts the detected negative voltage signal into a positive voltage signal, and turns on the positive voltage signal. The overvoltage regulation unit 14 compares the positive voltage signal turned on by the positive and negative voltage regulation unit 13 with a first preset threshold, adjusts the positive voltage signal that exceeds the first preset threshold to the range of the first preset threshold in a preset manner, and turns on the positive voltage signal within the range of the first preset threshold. AD sampling unit 15 is a single-channel analog-to-digital conversion unit.

[0031] It should be noted that conventional voltage and current signal sampling systems cannot sample both signals simultaneously, and the integrated dual-channel sampling system would result in an excessively large module size, affecting its practicality. However, the voltage and current adaptive sampling system 1 provided by this invention can integrate simultaneous sampling of voltage and current signals, and is set to a single channel, which greatly reduces the complexity of the module and thus reduces its size, making the sampling system more adaptable to various scenarios.

[0032] Understandably, the voltage-to-current conversion unit 12 does not intercept voltage signals, but is used to convert current signals into voltage signals; the AD sampling unit 15 converts analog signals into digital signals and samples them.

[0033] In one embodiment of the present invention, the voltage and current determination unit 11 includes a voltage and current detection circuit 111, at least one analog switch circuit 113, and a first flag bit manager 112. The output terminal of the voltage and current detection circuit 111 is connected to the input terminal of the first flag bit manager 112. After the voltage and current detection circuit 111 detects the input electrical signal, it judges the voltage signal and the current signal of the electrical signal and transmits the judgment result to the first flag bit manager 112. The output terminal of the first flag bit manager 112 is connected to the input terminal of different analog switch circuits 113 respectively. Based on the judgment result, the first flag bit manager 112 controls the different analog switch circuits 113 to turn on and off respectively, thereby conducting the corresponding voltage signal or current signal.

[0034] Specifically, the voltage and current determination unit 11 is used to identify the type of input signal and adjust the corresponding first flag manager 112. The first flag manager 112 outputs flags based on the voltage signal and the current signal as mutually exclusive signals, and has only two states (high or low).

[0035] More specifically, in one embodiment of the present invention, there are two analog switch circuits 113, which correspond to a voltage signal analog switch and a current signal analog switch, respectively. When the voltage and current detection circuit 111 detects that the input signal is a voltage signal, the first flag manager 112 controls the current signal analog switch to open and closes the voltage signal analog switch. When the voltage and current detection circuit 111 detects that the input signal is a current signal, the first flag manager 112 controls the voltage signal analog switch to open and the current signal analog switch to close.

[0036] Understandably, the two analog switch circuits 113 are mutually exclusive circuits, and their conduction states are always one on and one off.

[0037] In one embodiment of the present invention, the voltage-to-current conversion unit 12 includes a first operational scaling circuit and a high-precision resistor. The high-precision resistor is used to precisely control the conversion value between current and voltage. The first operational scaling circuit is used to assist in adjusting the final value of the high-precision resistor after converting the current signal into a voltage signal, so that the conversion accuracy is guaranteed when the resistance value setting of the high-precision resistor is not restricted. Specifically, the analog switch circuit 113 includes, but is not limited to, dedicated analog switch chips, metal-oxide-semiconductor field-effect transistors (MOSFETs), bipolar junction transistors (BJTs), insulated-gate bipolar transistors (IGBTs), and silicon controlled thyristors (SCRs). The first flag manager 112 includes, but is not limited to, using independent I / O as a manager, system-on-chip (SoC) as a manager, and digital chip as a manager.

[0038] The current signal flows into the high-precision resistor in the voltage-current conversion unit 12 and is converted into a voltage signal. The converted voltage signal is reduced or amplified by a preset factor based on the first operational scaling circuit. Alternatively, the current signal flows into the first operational scaling circuit in the voltage-current conversion unit 12 and is reduced or amplified based on a preset factor. The reduced or amplified current signal then flows into a high-precision resistor and is converted into a corresponding voltage signal.

[0039] Specifically, in one embodiment of the present invention, the resistance value of the high-precision resistor in the voltage-to-current conversion unit 12 is a positive integer, and the first operational scaling circuit is a step-down circuit.

[0040] It should be noted that high-precision resistors are used to convert current signals into voltage signals without causing the voltage signal to be too high. Therefore, it is best to choose a positive integer resistance value for high-precision resistors. Step-down circuits include, but are not limited to, resistor voltage divider circuits, RC voltage divider circuits, and chip variable voltage divider circuits.

[0041] Optionally, the resistance values ​​of the high-precision resistors are positive integers such as 1Ω, 2Ω, 3Ω, 5Ω, 8Ω, 10Ω, and 20Ω; Preferably, in a specific embodiment of the present invention, the resistance value of the high-precision resistor is 5Ω.

[0042] Please combine Figure 1 and Figure 3 In one embodiment of the present invention, the positive and negative voltage adjustment unit 13 includes a negative voltage determination unit 131, a negative voltage adjustment circuit 132 and a first filter circuit 133 connected in sequence. The negative voltage determination unit 131 determines whether the voltage output by the voltage-current conversion unit 12 is a positive voltage signal or a negative voltage signal; The negative voltage adjustment circuit 132 boosts the overall voltage signal that is determined to have a negative voltage signal; The first filter circuit 133 filters out noise signals from the boosted voltage signal.

[0043] Specifically, the voltage-to-current conversion unit 12 includes, but is not limited to, an IV conversion circuit built with operational amplifiers and an IV conversion circuit built with discrete components; Filtering circuits include, but are not limited to, active filtering circuits and passive filtering circuits.

[0044] Optionally, the negative voltage determination unit 131 includes, but is not limited to, a detection circuit built with discrete components, a detection circuit built with an operational amplifier, or a detection circuit built with a dedicated chip, used to detect and determine the positive or negative nature of the voltage signal of the circuit.

[0045] Please combine Figure 1 and Figure 4 In one embodiment of the present invention, the overvoltage regulation unit 14 includes a voltage determination unit 141, a second operational scaling circuit 142, and a second filtering circuit 143 connected in sequence. The voltage determination unit 141 compares the voltage signal output by the positive and negative voltage adjustment unit 13 with a second preset threshold to make a judgment; The second operational scaling circuit 142 scales the voltage signal that exceeds the second preset threshold proportionally so that the scaled voltage signal meets the second preset threshold. The second filter circuit 143 filters out noise signals from the proportionally scaled voltage signal.

[0046] In one embodiment of the present invention, the second operational scaling circuit is an isolation circuit, used to isolate the voltage signal output by the positive and negative voltage adjustment unit 13 into multiple scaling circuits, and to perform the same or different scaling on the voltage signal on each single circuit.

[0047] In one embodiment of the present invention, the AD sampling unit 15 includes a high-precision AD sampling circuit and a protection circuit.

[0048] Specifically, the AD sampling unit 15 is a single-channel sampling unit, including a high-precision AD sampling circuit and an electrostatic discharge protection circuit; Among them, the types of high-precision AD sampling circuits include, but are not limited to, successive approximation type digital-to-analog converter chips, integral type digital-to-analog converter chips, voltage-frequency conversion type digital-to-analog converter chips, parallel comparison type digital-to-analog converter chips, pipeline type digital-to-analog converter chips, and Σ-Δ type digital-to-analog converter chips; the types of electrostatic discharge (ESD) protection circuits include, but are not limited to, dedicated ESD protection chips and ESD protection diodes.

[0049] The technical solution of this invention employs a voltage and current determination unit to conduct voltage signals and intercept current signals, and a voltage-current conversion unit to convert the intercepted current signals into voltage signals. Based on the positive and negative voltage adjustment unit, the negative voltage of the passed voltage signals is boosted so that the voltages after passing are all positive voltages. Then, the overvoltage adjustment unit reduces the voltage exceeding the threshold to the threshold range, and finally transmits it to the AD sampling unit for acquisition. This design realizes the acquisition of multiple signals such as voltage and / or current, and the internal resistance of each adjustment unit is controllable, ensuring the accuracy of the acquired information and enhancing the adaptive capability of the voltage and current adaptive sampling system.

[0050] For specific details, please refer to... Figures 1-4 In one specific embodiment of the present invention, voltage signals and current signals are acquired simultaneously: When the voltage and current detection circuit 111 detects a voltage signal, it controls the voltage analog signal switch to turn on and the current analog signal switch to turn off. At the same time, when the voltage and current detection circuit 111 detects a current signal, it controls the voltage analog signal switch to open and the current analog signal switch to open. When the current signal flows through the voltage-current conversion unit 12, it is converted into a voltage signal U1. The value of the converted voltage signal U1 may be the same as or different from the value of the directly input voltage signal. When different voltage signals flow through the positive and negative voltage adjustment unit 13, the negative voltage determination unit within the positive and negative voltage adjustment unit 13 determines the negative voltage of the flowing voltage. Taking voltage signal U1 as an example: When a positive voltage is detected, the second flag manager controls the negative voltage signal simulator switch to open and the positive voltage signal simulator switch to open. When a negative voltage is detected, the second flag manager controls the negative voltage signal simulator switch to turn on and the positive voltage signal simulator switch to turn off, and the negative voltage flowing through is boosted to a positive voltage U2 in the negative voltage adjustment unit. All the collected positive voltages flow into the overvoltage regulation unit 14 after the first filter circuit filters out noise. Taking the positive voltage signal U2 as an example, in the overvoltage regulation unit 14, the voltage determination unit 141 determines whether it exceeds the preset threshold, and determines whether it needs to be scaled through a single channel or multiple channels of the second scaling circuit 142 based on the value exceeding the threshold. It should be noted that the scaling ratio of each channel in the second scaling circuit 142 can be the same or different, and can reduce, enlarge or not change the voltage signal output, thereby achieving high-precision and high-efficiency control of the voltage signal.

[0051] The positive voltage U2 is adjusted by the second scaling circuit 142 and then filtered by the second filtering circuit 143 to remove noise. The output is a positive voltage U3, which is then combined with other adjusted voltages and transmitted to the AD sampling unit for sampling.

[0052] Please see Figure 5 The present invention also proposes a servo valve 2, which includes a servo valve body 21 and a voltage and current adaptive sampling system 1 as described above. The specific structure of the voltage and current adaptive sampling system 1 is as described in the above embodiments. Since the servo valve 2 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0053] Among them, the voltage and current adaptive sampling system 1 can sample both voltage and current signals simultaneously.

[0054] It should be understood that the terms "one embodiment" or "one example" throughout the specification mean that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in one example" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to the invention.

[0055] In various embodiments of the present invention, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0056] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It is particularly important to note that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0057] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A voltage and current adaptive sampling system, characterized in that: It includes a voltage and current determination unit, a voltage and current conversion unit, a positive and negative voltage adjustment unit, an overvoltage adjustment unit, and an AD sampling unit connected in sequence; The voltage and current determination unit receives the input electrical signal and determines whether the electrical signal is a current signal or a voltage signal. The voltage-to-current conversion unit turns on a voltage signal, intercepts a current signal, and converts the current signal into a voltage signal. The positive and negative voltage adjustment unit detects the voltage signal turned on by the voltage-current conversion unit, converts the detected negative voltage signal into a positive voltage signal, and turns on the positive voltage signal. The overvoltage regulation unit compares the positive voltage signal turned on by the positive and negative voltage regulation unit with a first preset threshold, adjusts the positive voltage signal exceeding the first preset threshold to the range of the first preset threshold in a preset manner, and turns on the positive voltage signal within the range of the first preset threshold.

2. The voltage and current adaptive sampling system as described in claim 1, characterized in that: The voltage and current determination unit includes a voltage and current detection circuit, at least one analog switch circuit, and a first flag manager. The output terminal of the voltage and current detection circuit is connected to the input terminal of the first flag bit manager. After the voltage and current detection circuit detects the input electrical signal, it judges the voltage signal and current signal of the electrical signal and transmits the judgment result to the first flag bit manager. The output terminal of the first flag bit manager is connected to the input terminal of different analog switch circuits respectively. Based on the judgment result, the first flag bit manager controls the different analog switch circuits to turn on and off respectively, thereby conducting the corresponding voltage signal or current signal.

3. The voltage and current adaptive sampling system as described in claim 2, characterized in that: The number of analog switch circuits is two, corresponding to a voltage signal analog switch and a current signal analog switch respectively; When the voltage and current detection circuit detects that the input signal is a voltage signal, the first flag manager controls the current signal analog switch to open and the voltage signal analog switch to close. When the voltage and current detection circuit detects that the input signal is a current signal, the first flag manager controls the voltage signal analog switch to open and the current signal analog switch to close.

4. The voltage and current adaptive sampling system as described in claim 1, characterized in that: The voltage-to-current conversion unit includes a first operational scaling circuit and a high-precision resistor; The current signal flows into the high-precision resistor in the voltage-to-current conversion unit and is converted into a voltage signal. The converted voltage signal is reduced or amplified by the first operational scaling circuit based on a preset factor. Alternatively, the current signal flows into the first operational scaling circuit in the voltage-to-current conversion unit and is reduced or amplified based on a preset factor. The reduced or amplified current signal then flows into the high-precision resistor and is converted into a corresponding voltage signal.

5. The voltage and current adaptive sampling system as described in claim 4, characterized in that: The high-precision resistor in the voltage-to-current conversion unit has a positive integer resistance value, and the first operational scaling circuit is a step-down circuit.

6. The voltage and current adaptive sampling system as described in claim 1, characterized in that: The positive and negative voltage regulation unit includes a negative voltage determination unit, a negative voltage adjustment circuit and a first filter circuit connected in sequence. The negative voltage determination unit determines whether the voltage output by the voltage-current conversion unit is a positive or negative voltage signal; The negative voltage adjustment circuit boosts the overall voltage signal that is determined to have a negative voltage signal. The first filter circuit filters out noise signals from the boosted voltage signal.

7. The voltage and current adaptive sampling system as described in claim 1, characterized in that: The overvoltage regulation unit includes a voltage determination unit, a second operational scaling circuit, and a second filtering circuit connected in sequence. The voltage determination unit compares the voltage signal output by the positive and negative voltage adjustment unit with a second preset threshold to make a judgment; The second operational scaling circuit scales the voltage signal that exceeds the second preset threshold proportionally, so that the scaled voltage signal meets the second preset threshold. The second filter circuit filters out noise signals from the proportionally scaled voltage signal.

8. The voltage and current adaptive sampling system as described in claim 7, characterized in that: The second operational scaling circuit is an isolation circuit used to isolate the voltage signal output by the positive and negative voltage regulation unit into multiple scaling circuits, and to scale the voltage signal on each individual circuit in the same or different ways.

9. The voltage and current adaptive sampling system as described in claim 1, characterized in that: The AD sampling unit is a single-channel sampling unit, which includes a high-precision AD sampling circuit and a protection circuit.

10. A servo valve, comprising a servo valve body and a voltage and current adaptive sampling system as described in any one of claims 1-8, characterized in that: The voltage and current adaptive sampling system can sample both voltage and current signals simultaneously.

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