Servo valve control system and servo valve assembly

Abstract

The invention discloses a servo valve control system and a servo valve assembly, and relates to the technical field of servo valve control, the servo valve control system comprises a main control unit, a redundant power supply unit and a main and standby power supply switching circuit; the redundant power supply unit comprises a standby power supply, a booster circuit and a charging circuit, the charging circuit is electrically connected with the main power supply and the standby power supply, and the booster circuit is electrically connected with the standby power supply; the main and standby power supply switching circuit is electrically connected with the main power supply, the main control unit and the booster circuit respectively; when the main power supply is abnormal, the main and standby power supply switching circuit conducts the redundant power supply unit and the main control unit, so that the standby power supply supplies power to the main control unit through the booster circuit, and when the main power supply returns to normal, the main power supply is automatically switched to supply power to the main control unit. The redundant power supply unit and the main and standby power supply switching circuit are arranged, so that the servo valve control system can continue to operate normally when the main power supply is abnormal, and the reliability of the servo valve control system is improved.

Description

Technical Field

[0001] This invention relates to the field of servo valve control technology, and in particular to a servo valve control system and servo valve assembly. 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 equipment system.

[0003] The control system of a servo valve is a crucial component, and its performance directly impacts the overall performance of the servo valve. Currently, most servo valve control systems commonly suffer from the following problems:

[0004] Poor reliability: Abnormal power supply during operation can cause the entire servo valve control system to malfunction.

[0005] Instability under extreme operating conditions: Servo valve control systems are prone to damage under conditions such as high temperature, overpressure, and overcurrent. Summary of the Invention

[0006] This invention provides a servo valve control system and servo valve assembly to solve the technical problem that existing servo valve control systems in the related art will lose control and have poor reliability when the power supply is abnormal during operation.

[0007] In the first aspect, a servo valve control system is provided, including: a main control unit, a redundant power supply unit, and a main / backup power supply switching circuit;

[0008] The redundant power supply unit includes a backup power supply, a boost circuit, and a charging circuit. The charging circuit is electrically connected to both the main power supply and the backup power supply, and the boost circuit is electrically connected to the backup power supply.

[0009] The main and backup power switching circuit is electrically connected to the main power supply, the main control unit and the boost circuit, respectively.

[0010] When the primary power supply is abnormal, the main backup power switching circuit connects the redundant power supply unit and the main control unit, so that the backup power supply supplies power to the main control unit through the boost circuit. When the primary power supply returns to normal, it automatically switches the primary power supply to supply power to the main control unit.

[0011] In some embodiments, the servo valve control system further includes:

[0012] The circuit protection unit is used to collect the input voltage and input current of the main control unit and the temperature of the servo valve control system, and to control the main and backup power switching circuit to be connected or disconnected from the main control unit based on the input voltage and input current of the main control unit and the temperature of the servo valve control system.

[0013] In some embodiments, the circuit protection unit includes an overvoltage protection circuit, an overtemperature protection circuit, an undervoltage protection circuit, and an overcurrent protection circuit;

[0014] The overvoltage protection circuit disconnects the main backup power switching circuit and the main control unit when the input voltage of the main control unit is not lower than the preset first voltage, or connects the main backup power switching circuit and the main control unit when the input voltage of the main control unit is lower than the preset first voltage.

[0015] The over-temperature protection circuit disconnects the main and backup power switching circuit and the main control unit when the temperature of the servo valve control system is not within the preset temperature range, or connects the main and backup power switching circuit and the main control unit when the temperature of the servo valve control system is within the preset temperature range.

[0016] The undervoltage protection circuit disconnects the main backup power switching circuit and the main control unit when the input voltage of the main control unit is not higher than the preset second voltage, or connects the main backup power switching circuit and the main control unit when the input voltage of the main control unit is higher than the preset second voltage.

[0017] The overcurrent protection circuit is used to disconnect the main / backup power supply switching circuit and the main control unit when the input current of the main control unit is not lower than the preset current, or to turn on the main / backup power supply switching circuit and the main control unit when the input current of the main control unit is lower than the preset current.

[0018] In some embodiments, the overcurrent protection circuit includes either a resettable fuse or a circuit breaker.

[0019] In some embodiments, the servo valve control system further includes an electromagnetic interference suppression circuit electrically connected to the main / backup power supply switching circuit and the main control unit, respectively.

[0020] In some embodiments, the main control unit includes an MCU control circuit, at least one analog-to-digital converter circuit, and a current-to-voltage converter circuit;

[0021] The current-to-voltage conversion circuit is electrically connected to the MCU control circuit through an analog-to-digital conversion circuit. The analog signal output by the current-to-voltage conversion circuit is converted into a digital signal by the corresponding analog-to-digital conversion circuit and transmitted to the MCU control circuit.

[0022] In some embodiments, the servo valve control system further includes: a motor detection and drive unit electrically connected to the main control unit, the motor detection and drive unit including a motor current detection circuit, a motor back electromotive force detection circuit, and a motor angular displacement detection circuit;

[0023] The motor current detection circuit is electrically connected to the current-to-voltage conversion circuit. The current signal output by the motor current detection circuit is transmitted to the MCU control circuit through the current-to-voltage conversion circuit and the corresponding analog-to-digital conversion circuit.

[0024] The motor back EMF detection circuit is electrically connected to the MCU control circuit through an analog-to-digital converter circuit. The analog signal output by the motor back EMF detection circuit is converted into a digital signal by the corresponding analog-to-digital converter circuit and transmitted to the MCU control circuit.

[0025] The motor angular displacement detection circuit is electrically connected to the MCU control circuit through an analog-to-digital converter circuit. The analog signal output by the motor angular displacement detection circuit is converted into a digital signal by the corresponding analog-to-digital converter circuit and transmitted to the MCU control circuit.

[0026] In some embodiments, the MCU control circuit uses the feedback value from the motor angular displacement detection circuit as the first angular displacement value;

[0027] The MCU control circuit performs a fitting calculation of the motor angular displacement based on the feedback values ​​from the motor current detection circuit and the motor back EMF detection circuit, and the result of the fitting calculation is used as the second angular displacement value.

[0028] If the absolute value of the difference between the first angular displacement value and the second angular displacement value is within a preset range, the first angular displacement value is used as the final angular displacement value; if the absolute value of the difference between the first angular displacement value and the second angular displacement value is not within the preset range, the second angular displacement value is used as the final angular displacement value.

[0029] In some embodiments, the main control unit further includes a PWM control circuit electrically connected to the MCU control circuit, and the motor detection and drive unit further includes a motor drive circuit electrically connected to the PWM control circuit. The MCU control circuit controls the motor drive through the PWM control circuit.

[0030] Secondly, a servo valve assembly is provided, including a servo valve body and the aforementioned servo valve control system.

[0031] The beneficial effects of the technical solution provided by this invention include:

[0032] This invention provides a servo valve control system and a servo valve assembly. The servo valve control system includes a main control unit, a redundant power supply unit, and a main / backup power supply switching circuit. The redundant power supply unit includes a backup power supply, a boost circuit, and a charging circuit. When the main power supply is abnormal, the main / backup power supply switching circuit connects the redundant power supply unit to the main control unit, allowing the backup power supply to power the main control unit through the boost circuit, ensuring the continued normal operation of the servo valve control system and improving its reliability. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic block diagram of a servo valve control system provided in an embodiment of the present invention;

[0035] Figure 2 Another principle block diagram of a servo valve control system provided in an embodiment of the present invention;

[0036] Figure 3 Another principle block diagram of a servo valve control system provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram showing the connection between the main control unit and the motor detection and drive unit of a servo valve control system provided in an embodiment of the present invention.

[0038] Figure label:

[0039] 1. Servo valve control system;

[0040] 11. Main control unit; 111. MCU control circuit; 112. Analog-to-digital conversion circuit; 113. Current-to-voltage conversion circuit; 114. PWM control circuit; 115. Fault indication circuit; 116. Driver circuit hardware configuration circuit;

[0041] 12. Redundant power supply unit; 121. Charging circuit; 122. Backup power supply; 123. Boost circuit;

[0042] 13. Main and backup power supply switching circuit;

[0043] 14. Main power supply;

[0044] 15. Circuit protection unit; 151. Overvoltage protection circuit; 152. Overtemperature protection circuit; 153. Undervoltage protection circuit; 154. Overcurrent protection circuit;

[0045] 16. Electromagnetic interference suppression circuit;

[0046] 17. Motor detection and drive unit; 171. Motor current detection circuit; 172. Motor back EMF detection circuit; 173. Motor angular displacement detection circuit; 174. Motor drive circuit. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] This invention provides a servo valve control system to solve the technical problem that existing servo valve control systems suffer from poor reliability and loss of control when the power supply is abnormal during operation.

[0049] See Figure 1 As shown, an embodiment of the present invention provides a servo valve control system 1, including: a main control unit 11, a redundant power supply unit 12, and a main / backup power supply switching circuit 13.

[0050] The redundant power supply unit 12 includes a backup power supply 122, a boost circuit 123, and a charging circuit 121. The charging circuit 121 is electrically connected to both the main power supply 14 and the backup power supply 122, and the boost circuit 123 is electrically connected to the backup power supply 122. The main / backup power supply switching circuit 13 is electrically connected to the main power supply 14, the main control unit 11, and the boost circuit 123, respectively.

[0051] When the main power supply 14 is abnormal, the main backup power supply switching circuit 13 turns on the redundant power supply unit 12 and the main control unit 11, so that the backup power supply 122 supplies power to the main control unit 11 through the boost circuit 123. When the main power supply 14 returns to normal, it automatically switches the main power supply 14 to supply power to the main control unit 11.

[0052] Specifically, under normal circumstances, the main / backup power supply switching circuit 13 selectively connects the main power supply 14 and the redundant power supply unit 12 to the main control unit 11, controlling either the main power supply 14 or the backup power supply 122 to supply power to the main control unit 11. When the main power supply 14 supplies power to the main control unit 11, the charging circuit 121 uses the main power supply 14 to charge the backup power supply 122, keeping the backup power supply 122 sufficiently charged.

[0053] Optionally, the main power supply 14 can be the rectified and transformed power from an external power source (such as 220V AC mains). The backup power supply 122 can be a lithium battery, which has high energy density, long service life, and is environmentally friendly. The main / backup power supply switching circuit 13 can use a semiconductor switch. The switching time of the semiconductor switch circuit is 2µs to 500ms, ensuring that in the event of an anomaly in the main power supply 14, the backup power supply 122 can immediately supply power to the main control unit 11.

[0054] When the main power supply 14 malfunctions, the main / backup power supply switching circuit 13 can disconnect the main power supply 14 from the main control unit 11 based on the feedback signal of the main power supply 14 malfunction, and simultaneously connect the redundant power supply unit 12 to the main control unit 11. At this time, the boost circuit 123 boosts the backup power supply 122 and outputs it to the main control unit 11 to supply power to the main control unit 11, ensuring that the servo valve control system 1 continues to operate normally. For example, when the output voltage of the main power supply 14 is too high or too low, a feedback signal (e.g., a high-level signal) can be generated to the main / backup power supply switching circuit 13. The main / backup power supply switching circuit 13 disconnects the main power supply 14 from the main control unit 11 based on the high-level feedback signal, and simultaneously connects the redundant power supply unit 12 to the main control unit 11.

[0055] When the main power supply 14 returns to normal, the feedback signal changes from a high level signal to a low level signal and is output to the main and backup power supply switching circuit 13. The main and backup power supply switching circuit 13 can disconnect the redundant power supply unit 12 from the main control unit 11 according to the low level feedback signal, and at the same time connect the main power supply 14 to the main control unit 11, automatically switching back to using the main power supply 14 to power the main control unit 11.

[0056] In the servo valve control system 1 of this embodiment of the invention, when the main power supply 14 is abnormal, the main backup power supply switching circuit 13 connects the boost circuit 123 with the main control unit 11, so that the backup power supply 122 supplies power to the main control unit 11 through the boost circuit 123, ensuring that the servo valve control system continues to operate normally and improving the reliability of the servo valve control system 1.

[0057] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 2 As shown, the servo valve control system 1 also includes a circuit protection unit 15, which is used to collect data on the input voltage, input current and temperature of the main control unit 11 and control the main backup power switching circuit 13 to be turned on or off with the main control unit 11 based on the collected data.

[0058] In the servo valve control system 1 of this embodiment, the circuit protection unit 15 can disconnect the main power supply 14 or the boost circuit 123 from the main control unit 11 under extreme operating conditions, so that the servo valve stops running and enters the protection mode, thereby further improving the reliability of the servo valve control system 1.

[0059] Furthermore, the circuit protection unit 15 includes an overvoltage protection circuit 151, an overtemperature protection circuit 152, an undervoltage protection circuit 153, and an overcurrent protection circuit 154.

[0060] The overvoltage protection circuit 151 disconnects the main backup power switching circuit 13 and the main control unit 11 when the input voltage of the main control unit 11 is not lower than the preset first voltage, or connects the main backup power switching circuit 13 and the main control unit 11 when the input voltage of the main control unit 11 is lower than the preset first voltage.

[0061] The over-temperature protection circuit 152 disconnects the main / backup power switching circuit 13 and the main control unit 11 when the temperature of the servo valve control system 1 is outside the preset temperature range, or connects the main / backup power switching circuit 13 and the main control unit 11 when the temperature of the servo valve control system 1 is within the preset temperature range. That is, in this embodiment of the invention, the main / backup power switching circuit 13 and the main control unit 11 will be disconnected when the temperature is too high or too low, thus protecting the servo valve control system 1.

[0062] The undervoltage protection circuit 153 disconnects the main / backup power supply switching circuit 13 from the main control unit 11 when the input voltage of the main control unit 11 is not higher than a preset second voltage, or connects the main / backup power supply switching circuit 13 from the main control unit 11 when the input voltage of the main control unit 11 is higher than the preset second voltage. The preset second voltage is lower than a preset first voltage. Additionally, the undervoltage protection circuit 153 can generate a voltage recording log to provide data support for subsequent data analysis.

[0063] The overcurrent protection circuit 154 is used to disconnect the main and backup power supply switching circuit 13 from the main control unit 11 when the input current of the main control unit 11 is not lower than the preset current, or to connect the main and backup power supply switching circuit 13 from the main control unit 11 when the input current of the main control unit 11 is lower than the preset current.

[0064] Overvoltage protection circuit 151, overtemperature protection circuit 152, undervoltage protection circuit 153, and overcurrent protection circuit 154 serve as protection modules for the servo valve control system 1 under extreme operating conditions. These modules ensure the servo valve control system 1 can self-protect under extreme conditions, guaranteeing stable operation and improving its reliability. Furthermore, all four circuits have self-resetting functions. When the protection mechanism needs to be deactivated, the main / backup power supply switching circuit 13 is connected to the main control unit 11, allowing the servo valve control system 1 to continue normal operation. For example, the overcurrent protection circuit 154 can use a self-resetting fuse or circuit breaker. When a large current flows through the overcurrent protection circuit 154, the self-resetting fuse or circuit breaker trips. When the large current signal disappears, the self-resetting fuse or circuit breaker resumes conduction, and the servo valve control system 1 returns to normal operation.

[0065] It should be noted that the overvoltage protection circuit 151, overheat protection circuit, undervoltage protection circuit 153, and overcurrent protection circuit 154 can also achieve protection and recovery functions by controlling the on / off state of the main / backup power supply switching circuit 13. Both of the above methods can disconnect the main power supply 14 or the backup power supply 122 from the main control unit 11, preventing the servo valve control system 1 from operating under adverse conditions and protecting the servo valve control system 1.

[0066] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 3 As shown, the servo valve control system 1 also includes an electromagnetic interference suppression circuit 16 electrically connected to the main / backup power supply switching circuit 13 and the main control unit 11, respectively. The electromagnetic interference suppression circuit 16 can prevent electronic components from being damaged by potential electromagnetic interference, protecting the normal operation of the servo valve control system 1. The electromagnetic interference suppression circuit 16 can employ common-mode inductors, electrostatic discharge and surge protectors, Y capacitors, varistors, and gas discharge tubes. Preferably, electrostatic discharge and surge protectors are used for the first level of protection, and varistors are used in combination with gas discharge tubes for the second level of protection.

[0067] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 4 As shown, the main control unit 11 includes an MCU control circuit 111, at least one analog-to-digital converter circuit 112, and a current-to-voltage converter circuit 113. The current-to-voltage converter circuit 113 is electrically connected to the MCU control circuit 111 through an analog-to-digital converter circuit 112. The analog signal output by the current-to-voltage converter circuit 113 is converted into a digital signal by the corresponding analog-to-digital converter circuit 112 and transmitted to the MCU control circuit 111.

[0068] The analog-to-digital converter (ADC) 112 serves as a tool for converting analog signals to digital signals, while the current-to-voltage converter (DC-VDC) 113 serves as a platform for converting current signals to voltage signals. The ADC 112 can be a successive approximation ADC chip, an integrating ADC chip, a voltage-to-frequency conversion ADC chip, a parallel comparator ADC chip, a pipelined ADC chip, or a Σ-Δ ADC chip. The DC-VDC converter 113 can be a current-to-voltage converter built with operational amplifiers or a current-to-voltage converter built with discrete components.

[0069] Furthermore, the servo valve control system 1 also includes: a motor detection and drive unit 17 electrically connected to the main control unit 11, the motor detection and drive unit 17 including a motor current detection circuit 171, a motor back electromotive force detection circuit 172, and a motor angular displacement detection circuit 173.

[0070] The motor current detection circuit 171 is electrically connected to the current-to-voltage conversion circuit 113. The current signal output by the motor current detection circuit 171 is transmitted to the MCU control circuit 111 through the current-to-voltage conversion circuit 113 and the corresponding analog-to-digital conversion circuit 112. The motor current detection circuit 171 serves as a current signal feedback channel for motor motion. The motor current detection circuit 171 includes, but is not limited to, direct current sampling, indirect current sampling, individual sampling of three-phase circuits, and total current sampling of three-phase circuits.

[0071] The motor back EMF detection circuit 172 is electrically connected to the MCU control circuit 111 via an analog-to-digital converter circuit 112. The analog signal output by the motor back EMF detection circuit 172 is converted into a digital signal by the corresponding analog-to-digital converter circuit 112 and transmitted to the MCU control circuit 111. The motor back EMF detection circuit 172 serves as a means of monitoring the back EMF during motor operation. The motor back EMF detection circuit 172 includes, but is not limited to, direct voltage sampling and indirect voltage sampling. In this embodiment of the invention, the motor speed, position, and current motor operating current can be fitted based on the current feedback value and the back EMF value to further infer the motor's operating state.

[0072] The motor angular displacement detection circuit 173 is electrically connected to the MCU control circuit 111 through an analog-to-digital converter circuit 112. The analog signal output by the motor angular displacement detection circuit 173 is converted into a digital signal by the corresponding analog-to-digital converter circuit 112 and transmitted to the MCU control circuit 111. The motor angular displacement detection circuit 173 is used to acquire the angular displacement of the motor in the servo valve. The sensors used in the motor angular displacement detection circuit 173 include, but are not limited to, capacitive encoders, photoelectric encoders, magnetic encoders, Hall sensors, tunneling magnetoresistive (TMR) effect sensors, giant magnetoresistive (CMR) effect sensors, giant magnetoresistive (GMR) effect sensors, anisotropic magnetoresistive (AMR) effect sensors, inductive sensors, resistive sensors, micro-motor system sensors, and laser sensors.

[0073] Furthermore, the MCU control circuit 111 uses the feedback value from the motor angular displacement detection circuit 173 as the first angular displacement value; the MCU control circuit 111 performs fitting calculation of the motor angular displacement based on the feedback values ​​from the motor current detection circuit 171 and the motor back EMF detection circuit 172, and the result of the fitting calculation is used as the second angular displacement value.

[0074] If the absolute value of the difference between the first angular displacement value and the second angular displacement value is within a preset range, the first angular displacement value is used as the final angular displacement value; if the absolute value of the difference between the two angular displacement values ​​is not within a preset range, the second angular displacement value is used as the final angular displacement value.

[0075] The servo valve control system of this invention determines the final angular displacement value by making reasonable judgments based on the directly acquired first angular displacement value and the fitted calculated second angular displacement value, thereby increasing the redundancy of the control data.

[0076] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 4 As shown, the main control unit 11 also includes a PWM control circuit 114 electrically connected to the MCU control circuit 111, and the motor detection and drive unit 17 also includes a motor drive circuit 174 electrically connected to the PWM control circuit 114. The MCU control circuit 111 controls the motor drive through the PWM control circuit 114.

[0077] The PWM control circuit 114 can output a PWM control waveform directly from the microcontroller or from a dedicated PWM waveform generation chip. The MCU control circuit 111 controls the PWM control circuit 114 to output a PWM waveform based on the final angular displacement value and internal control algorithm, precisely controlling the servo valve motor. The motor drive circuit 174 can employ an H-bridge drive circuit, including but not limited to directly driving the H-bridge or indirectly driving it through a dedicated drive chip. The switching devices in the H-bridge drive circuit include, but are not limited to, semiconductor-based dedicated integrated chip-embedded switching devices, MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistors), BJTs (Bipolar Junction Transistors), IGBTs (Insulated-Gate Bipolar Transistors), and SCRs (Silicon Controlled Rectifiers).

[0078] As an optional implementation, in one embodiment of the invention, see [link to relevant documentation]. Figure 4 As shown, the main control unit 11 also includes a drive circuit hardware configuration circuit 116 and a fault indication circuit 115. The drive circuit hardware configuration circuit 116 can perform hardware configuration on the motor drive circuit 174, and the fault indication circuit 115 can serve as a fault display platform for the servo valve control system 1. Specifically, the MCU control circuit 111 sends information to the fault indication circuit 115 via the I / O bus, and the fault indication circuit 115 then transmits the fault signal to the outside world.

[0079] As an optional implementation, in one embodiment of the invention, the boost circuit 123 is a Boost converter. A Boost converter can raise a lower voltage to the required voltage level while maintaining high conversion efficiency, and also has advantages such as simple circuitry and low cost. The Boost converter can be a Boost converter constructed from a dedicated power supply chip or a Boost converter built from discrete components.

[0080] This invention also provides a servo valve assembly, including a servo valve body and the aforementioned servo valve control system.

[0081] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0082] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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.

[0083] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A servo valve control system, characterized in that, include: Main control unit, redundant power supply unit and main / backup power supply switching circuit; The redundant power supply unit includes a backup power supply, a boost circuit, and a charging circuit. The charging circuit is electrically connected to both the main power supply and the backup power supply, and the boost circuit is electrically connected to the backup power supply. The main and backup power switching circuit is electrically connected to the main power supply, the main control unit and the boost circuit, respectively. When the primary power supply is abnormal, the main backup power switching circuit connects the redundant power supply unit and the main control unit, so that the backup power supply supplies power to the main control unit through the boost circuit. When the primary power supply returns to normal, it automatically switches the primary power supply to supply power to the main control unit.

2. The servo valve control system according to claim 1, characterized in that, The servo valve control system also includes: The circuit protection unit collects data on the input voltage and current of the main control unit and the temperature of the servo valve control system, and controls the main / backup power supply switching circuit to be connected or disconnected from the main control unit based on the collected data.

3. The servo valve control system according to claim 2, characterized in that: The circuit protection unit includes an overvoltage protection circuit, an overtemperature protection circuit, an undervoltage protection circuit, and an overcurrent protection circuit. The overvoltage protection circuit disconnects the main backup power switching circuit and the main control unit when the input voltage of the main control unit is not lower than the preset first voltage, or connects the main backup power switching circuit and the main control unit when the input voltage of the main control unit is lower than the preset first voltage. The over-temperature protection circuit disconnects the main and backup power switching circuit and the main control unit when the temperature of the servo valve control system is not within the preset temperature range, or connects the main and backup power switching circuit and the main control unit when the temperature of the servo valve control system is within the preset temperature range. The undervoltage protection circuit disconnects the main backup power switching circuit and the main control unit when the input voltage of the main control unit is not higher than the preset second voltage, or connects the main backup power switching circuit and the main control unit when the input voltage of the main control unit is higher than the preset second voltage. The overcurrent protection circuit disconnects the main / backup power supply switching circuit and the main control unit when the input current of the main control unit is not lower than the preset current, or connects the main / backup power supply switching circuit and the main control unit when the input current of the main control unit is lower than the preset current.

4. The servo valve control system according to claim 3, characterized in that: The overcurrent protection circuit includes either a resettable fuse or a circuit breaker.

5. The servo valve control system according to claim 1, characterized in that, The servo valve control system further includes an electromagnetic interference suppression circuit that is electrically connected to the main / backup power supply switching circuit and the main control unit, respectively.

6. The servo valve control system according to claim 1, characterized in that: The main control unit includes an MCU control circuit, at least one analog-to-digital converter circuit, and a current-to-voltage converter circuit. The current-to-voltage conversion circuit is electrically connected to the MCU control circuit through an analog-to-digital conversion circuit. The analog signal output by the current-to-voltage conversion circuit is converted into a digital signal by the corresponding analog-to-digital conversion circuit and transmitted to the MCU control circuit.

7. The servo valve control system according to claim 6, characterized in that, The servo valve control system further includes: a motor detection and drive unit electrically connected to the main control unit, the motor detection and drive unit including a motor current detection circuit, a motor back electromotive force detection circuit, and a motor angular displacement detection circuit; The motor current detection circuit is electrically connected to the current-to-voltage conversion circuit. The current signal output by the motor current detection circuit is transmitted to the MCU control circuit through the current-to-voltage conversion circuit and the corresponding analog-to-digital conversion circuit. The motor back EMF detection circuit is electrically connected to the MCU control circuit through an analog-to-digital converter circuit. The analog signal output by the motor back EMF detection circuit is converted into a digital signal by the corresponding analog-to-digital converter circuit and transmitted to the MCU control circuit. The motor angular displacement detection circuit is electrically connected to the MCU control circuit through an analog-to-digital converter circuit. The analog signal output by the motor angular displacement detection circuit is converted into a digital signal by the corresponding analog-to-digital converter circuit and transmitted to the MCU control circuit.

8. The servo valve control system according to claim 7, characterized in that: The MCU control circuit uses the feedback value from the motor angular displacement detection circuit as the first angular displacement value; The MCU control circuit performs a fitting calculation of the motor angular displacement based on the feedback values ​​from the motor current detection circuit and the motor back EMF detection circuit, and the result of the fitting calculation is used as the second angular displacement value. If the absolute value of the difference between the first angular displacement value and the second angular displacement value is within a preset range, the first angular displacement value shall be used as the final angular displacement value. If the absolute value of the difference between the first angular displacement value and the second angular displacement value is not within the preset range, the second angular displacement value shall be used as the final angular displacement value.

9. The servo valve control system according to claim 7, characterized in that: The main control unit further includes a PWM control circuit electrically connected to the MCU control circuit, and the motor detection and drive unit further includes a motor drive circuit electrically connected to the PWM control circuit. The MCU control circuit controls the motor drive through the PWM control circuit.

10. A servo valve assembly, characterized in that: It includes a servo valve body and a servo valve control system according to any one of claims 1-9.

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