Configurable power discrete quantity output interface circuit and method for protection

Abstract

The present invention relates to the technical field of airborne computer interface, and particularly relates to a protected configurable power discrete quantity output interface circuit and method. The interface circuit includes an aircraft electromechanical management system, a controller, a comparison unit, a D / A conversion unit, a driving unit, a discrete quantity input unit, a current conversion unit, and a power switch tube Q1. The controller is used to receive interface control instructions, trip lock / unlock instructions, and power load drive current configuration information sent by the aircraft electromechanical management system, control the power discrete quantity output interface to be turned on or off, and implement parameter configuration of the current protection curve. The D / A conversion unit and the comparison unit replace the traditional current sampling and protection through an A / D conversion unit. By comprehensively applying the circuit and method of the present invention, dynamic configuration of the current protection point and duration of the power output interface for different loads can be achieved, and the interface has the advantages of self-recovery, high reliability, strong anti-interference ability, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of airborne computer interfaces, and particularly relates to a method for protecting a configurable power discrete output interface circuit. Background Art

[0002] A large number of power 28V / open discrete output interfaces are included in aircraft airborne systems, which are used to drive relays, contactors, and solenoid valves to work and achieve state control. With the development of mechatronics integration, such interfaces are integrated into the core important components of the mechatronic control and management system, namely, the remote interface unit or the mechatronic management computer. Once such an interface fails, it will cause a large-scale fault spread, resulting in abnormal operation of the entire system. Therefore, it is particularly important to achieve high-security and high-reliability output for the power 28V / open discrete output interface.

[0003] Traditional protection methods for power 28V / open discrete output interfaces generally adopt protection methods based on fuses or single overload points, which have defects such as slow response time of protection actions, false tripping, and small application ranges. In recent years, with the emergence of solid-state power controllers, inverse time protection algorithms based on current-time have been widely applied. The software and hardware implementations of such protection algorithms are relatively complex. Especially for the acquisition of load current, restricted by the A / D sampling accuracy and the results being easily interfered, the system will have abnormal tripping, reducing the system reliability and limiting its application fields. Summary of the Invention

[0004] In view of this, the present invention provides a configurable power discrete output interface circuit protection method to achieve dynamic configuration of the power 28V / open discrete output interface for different load current protection points and durations, simplify the complexity of software and hardware design, and improve the reliability and anti-interference ability of the interface.

[0005] A configurable power discrete output interface circuit protection method is applicable to the power control of an aircraft mechatronic management system. The aircraft mechatronic management system sends interface control instructions and power load drive current configuration information to the controller according to the requirements of the aircraft mission system and physical configuration, and comprehensively judges and processes the tripping state sent by the controller.

[0006] The controller is used to receive the interface control instructions, tripping lock / unlock instructions, and power load drive current configuration information sent by the aircraft mechatronic management computer, control the power discrete output interface to be turned on or off, and implement parameter configuration of the current protection curve.

[0007] The comparison unit is used to compare the output of the current conversion unit with the output of the D / A conversion unit, and input the comparison result into the controller.

[0008] The D / A conversion unit is used to receive the overcurrent protection threshold control instruction sent by the controller and convert it into an overcurrent protection threshold voltage;

[0009] The driving unit is used to receive the control instruction of the power switch tube Q1 sent by the controller and drive the power switch tube Q1 to turn on or off;

[0010] The discrete quantity input unit is used to receive the configuration instruction sent by the controller, collect the on-state of the power switch tube Q1 in real time, and send the collected result to the controller;

[0011] The current conversion unit is used to convert the output current signal of the power discrete quantity output interface into a voltage signal and deliver it to the comparison unit;

[0012] The power switch tube Q1 is used to turn on or off the power discrete quantity output interface. The input end of the power switch tube Q1 is connected to the power supply through the current conversion unit; the output end of the power switch tube Q1 is connected to the power load in the electromechanical system through the diode D2 and connected to the controller through the discrete quantity input unit; a diode D1 is anti-parallel connected between the input end and the output end of the power switch tube Q1. Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is the functional block diagram of the output interface of the present invention;

[0015] Figure 2 It is the schematic diagram of the configuration of the time-sharing overcurrent continuous amplitude and continuous time;

[0016] Figure 3 It is the tripping self-test flow chart;

[0017] Figure 4 Shown is the tripping self-test and energy accumulation timing diagram. Detailed Embodiments

[0018] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0019] The following describes the embodiments of the present disclosure through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0020] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present disclosure, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, this device can be implemented and this method can be practiced using other structures and / or functions in addition to one or more of the aspects described herein.

[0021] As Figure 1 shown, the protected configurable power discrete quantity output interface circuit is applicable to the power control of the aircraft electromechanical management system. For example, in the electromechanical management system, the 28V / open discrete quantity output power control includes an aircraft electromechanical management system, a controller, a comparison unit, a D / A conversion unit, a drive unit, a discrete quantity input unit, and a current conversion unit. The controller includes a CPU controller and an FPGA controller, where:

[0022] The aircraft electromechanical management system sends an interface control instruction and power load drive current configuration information to the controller according to the requirements of the aircraft mission system and the physical configuration; comprehensively judges and processes the trip state sent by the controller;

[0023] The controller is used to receive the interface control instruction, trip lock / unlock instruction, and power load drive current configuration information sent by the aircraft electromechanical management computer, control the power discrete quantity output interface to be connected or disconnected, and implement the parameter configuration of the current protection curve;

[0024] The comparison unit is used to compare the output of the current conversion unit with the output of the D / A conversion unit, and input the comparison result into the controller;

[0025] The D / A conversion unit is used to receive the current overcurrent protection threshold control instruction sent by the controller and convert it into an overcurrent protection threshold voltage;

[0026] The driving unit is used to receive the power switch tube Q1 control instruction sent by the controller and drive the power switch tube Q1 to turn on or off;

[0027] The discrete quantity input unit is used to receive the configuration instruction sent by the controller, collect the conduction state of the power switch tube Q1 in real time, and send the collection result to the controller;

[0028] The current conversion unit is used to convert the output current signal of the power discrete quantity output interface into a voltage signal and transmit it to the comparison unit;

[0029] The power switch tube Q1 is used to turn on or off the power discrete quantity output interface. The input end of the power switch tube Q1 is connected to the power supply through the current conversion unit; the output end of the power switch tube Q1 is connected to the power load in the electromechanical system through the diode D2 and to the controller through the discrete quantity input unit; a diode D1 is anti-parallel connected between the input end and the output end of the power switch tube Q1.

[0030] The D / A conversion unit is used to receive the control instruction of the controller and convert it into a voltage.

[0031] As a specific implementation manner provided in this case, a lightning protection unit is connected between the output end of the power switch tube Q1 and the load, providing the lightning protection function of the power 28V / open discrete quantity output interface.

[0032] As a specific implementation manner provided in this case, the controller includes a CPU controller and an FPGA controller. The CPU controller is connected to the aircraft electromechanical management system through a high-speed bus, and the FPGA controller and the CPU controller are connected through an internal bus, where:

[0033] The CPU controller receives the interface control instruction, trip lock / unlock instruction, and power load current configuration information sent by the aircraft electromechanical management system; calculates the parameter configuration information of the overcurrent protection threshold voltage and the sustainable time of the overcurrent state required for the FPGA controller to implement the configuration protection; judges the BIT state and overcurrent state sent by the FPGA controller; controls the FPGA controller to perform a trip self-test and retry.

[0034] The FPGA controller receives the interface control instruction and the trip lock / unlock instruction sent by the CPU controller; receives the parameter configuration information of the comparison voltage threshold voltage and the overcurrent state sustainable time of the comparison unit sent by the CPU controller; collects the overcurrent state of the comparison unit, completes the inverse time energy accumulation calculation, outputs the protection and trip state settings; collects the status information of the discrete input unit; outputs the drive unit control instruction to drive the power switch Q1 to turn on or off.

[0035] As a specific implementation provided in this case, the traditional A / D conversion unit is replaced by a D / A conversion unit and a comparison unit. The output voltage of the D / A conversion unit and the overcurrent state sustainable time of the overcurrent indication unit can be configured in multiple stages and time-sharing.

[0036] The controller configures the current amplitude threshold of the power interface protection by configuring the output voltage of the D / A conversion unit; the controller configures the sustainable time of the threshold current of the power interface by configuring the overcurrent state sustainable time of the overcurrent indication unit. The purpose is: only one power switch Q1 is used, and different power load protection thresholds can be achieved through the output voltage of the D / A conversion unit. For example, for a DC motor with a large starting current, the circuit protection threshold can be 7-10 times the rated current, and for a stepper motor with a small starting current, it can be configured as 1-2 times. The protection time is configurable, and the protection curve can be designed according to the overcurrent tolerance of different loads to prevent misoperation of the protection. The D / A conversion unit replaces the traditional A / D conversion unit, with a fast response time and improved anti-interference ability.

[0037] Secondly, a method for protecting a configurable power discrete output interface uses some or all of the above circuits, which includes a method for setting the trip state, where:

[0038] The controller accumulates energy for the collected overcurrent state. When the overcurrent state is valid, the energy value increases, and vice versa, the energy value decreases;

[0039] When the energy accumulation value is greater than the trip maximum threshold, the trip state is set to valid; when the trip state is valid, the controller sets the drive unit to output a disconnection drive signal.

[0040] Furthermore, it also includes a controller, and a trip self-test method implemented by the controller during the power-on self-test stage, where:

[0041] The controller controls the drive unit to output a disconnection instruction; the controller collects the results of the discrete input unit; the controller reads the trip status; when the controller determines that the collection result of the discrete input unit is on or the read trip status is valid, it determines an interface fault, sets the trip test to fail, ends the trip self-test, and locks the interface. Otherwise, the controller configures the duration for the overcurrent state to be sustainable, configures the negative voltage threshold output by the D / A conversion unit, and after a certain time delay, the controller reads the trip status. When the read result shows that the trip status is invalid, it sets the trip test to fail, ends the trip self-test, and locks the interface. If it is valid, the controller configures the voltage output by the D / A conversion unit to be the normal current protection threshold; the controller clears the trip status and zeros the energy accumulation value, and then, after a certain time delay, the controller reads the trip status. When the read result shows that the trip status is invalid, it sets the trip test to succeed, otherwise it sets the trip test to fail, ends the trip self-test, and locks the interface.

[0042] Figure 2 The figure shows a schematic diagram of the configuration of the time-sharing overcurrent continuous amplitude and duration. Through configuring the output voltage of the D / A conversion unit and the duration for the overcurrent state of the overcurrent indication unit, multi-stage time-sharing configuration is carried out. For example, in the motor load startup stage, a larger overcurrent protection point and a shorter sustainable time are configured. After the motor enters normal rotation, a smaller overcurrent protection point and a longer sustainable time are configured, so as to ensure that the motor drive is in the best protection state.

[0043] Figure 3 The figure shows a timing diagram of the trip self-test and energy accumulation. The setting method of the trip status is as follows: the FPGA controller accumulates energy for the collected overcurrent state. When the overcurrent state is valid, the energy value increases; otherwise, the energy value decreases. When the energy accumulation value is greater than the trip maximum threshold, the trip status is set to valid. When the trip status is valid, the FPGA controller sets the drive unit to output a disconnection drive signal.

[0044] Figure 4 The figure shows a flowchart of the trip self-test. The trip self-test is implemented in the power-on test stage, and the specific steps are as follows:

[0045] Step 1: The CPU controller controls the drive unit to output a disconnection signal through the FPGA controller; the CPU controller collects the results of the discrete input unit through the FPGA controller; the CPU controller reads the trip status of the FPGA controller; when the CPU controller determines that the result of the discrete input unit is off and the trip status is invalid, it proceeds to Step 2, otherwise it sets an interface fault, sets the trip test to fail, and ends the trip self-test;

[0046] Step 2: The CPU controller configures the comparison voltage threshold output by the D / A conversion unit controlled by the FPGA controller to a negative voltage, and the CPU controller configures the sustainable time of the over-current state of the FPGA controller, then proceed to Step 3;

[0047] Step 3: After a determined time delay, the CPU controller reads the trip state of the FPGA controller. When the read result indicates that the trip state is valid, proceed to Step 4; otherwise, set the trip test to fail and end the trip self-test.

[0048] Step 4: The CPU controller configures the voltage output by the D / A conversion unit controlled by the FPGA controller to the normal operating threshold; the CPU controller sends a clear trip instruction and clears the energy accumulation value to the FPGA controller, then proceed to Step 5;

[0049] Step 5: After a determined time delay, the CPU controller reads the trip state of the FPGA controller. When the read result indicates that the trip state is invalid, set the trip test to succeed; otherwise, set the trip test to fail and end the trip self-test.

[0050] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present disclosure should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A protection circuit for a configurable discrete power output interface, applicable to power control in an aircraft electromechanical management system, characterized in that It includes a controller, a comparison unit, a D / A conversion unit, a driving unit, a discrete quantity input unit, a current conversion unit, and a power switch Q1, where: The aircraft electromechanical management system, according to the requirements and physical configuration of the aircraft mission system, sends interface control instructions and power load drive current configuration information to the controller; comprehensively judges and processes the trip status sent by the controller; The controller is used to receive the interface control instructions, trip lock / unlock instructions, and power load drive current configuration information sent by the aircraft electromechanical management computer, control the power discrete quantity output interface to be turned on or off, and implement the parameter configuration of the current protection curve; The comparison unit is used to compare the output of the current conversion unit with the output of the D / A conversion unit, and input the comparison result into the controller; The D / A conversion unit is used to receive the current overcurrent protection threshold control instruction sent by the controller and convert it into an overcurrent protection threshold voltage; The driving unit is used to receive the power switch Q1 control instruction sent by the controller and drive the power switch Q1 to be turned on or off; The discrete quantity input unit is used to receive the configuration instruction sent by the controller, collect the conduction state of the power switch Q1 in real time, and send the collection result to the controller; The current conversion unit is used to convert the output current signal of the power discrete quantity output interface into a voltage signal and transmit it to the comparison unit; The power switch Q1 is used to turn on or off the power discrete quantity output interface; the input end of the power switch Q1 is connected to the power supply through the current conversion unit; the output end of the power switch Q1 is connected to the power load in the electromechanical system through the diode D2 and to the controller through the discrete quantity input unit; a diode D1 is anti-parallel connected between the input end and the output end of the power switch Q1, and a lightning protection unit is connected between the output end of the power switch Q1 and the load; The controller includes a CPU controller and an FPGA controller. The CPU controller is connected to the aircraft electromechanical management system through a high-speed bus, and the FPGA controller and the CPU controller are connected through an internal bus, where: The CPU controller receives the interface control instructions, trip lock / unlock instructions, and power load current configuration information sent by the aircraft electromechanical management system; calculates the parameter configuration information of the overcurrent protection threshold voltage and the sustainable time of the overcurrent state required for the FPGA controller to implement configuration protection; judges the BIT state and overcurrent state sent by the FPGA controller; controls the FPGA controller to perform trip self-test and retry; The FPGA controller receives the interface control instructions and trip lock / unlock instructions sent by the CPU controller; receives the parameter configuration information of the comparison voltage threshold voltage and the sustainable time of the overcurrent state of the comparison unit sent by the CPU controller; collects the overcurrent state of the comparison unit, completes the inverse time energy accumulation calculation, output protection, and trip state setting; collects the status information of the discrete quantity input unit; outputs a driving unit control instruction to drive the power switch Q1 to be turned on or off.

2. The configurable power discrete quantity output interface circuit according to claim 1, characterized in that The traditional A / D conversion unit is replaced by the D / A conversion unit and the comparison unit, and the output voltage of the D / A conversion unit and the duration of the overcurrent state of the overcurrent indication unit can be configured in multiple stages and time-sharing, where: The CPU controller configures the output voltage of the D / A conversion unit through the FPGA controller and configures the current amplitude threshold for power interface protection; the CPU controller configures the upper limit value of the energy accumulation of the overcurrent state sent by the comparison unit through the FPGA controller and configures the duration of the threshold current of the power interface.

3. A method for protecting a configurable power discrete quantity output interface, characterized in that, Using the protected configurable power discrete quantity output interface circuit according to any one of claims 1 to 2, characterized in that it includes a method for setting the trip state, where: The controller accumulates the energy of the collected overcurrent state. When the overcurrent state is valid, the energy value increases; otherwise, the energy value decreases. When the energy accumulation value is greater than the trip maximum threshold, the trip state is set to be valid; when the trip state is valid, the controller sets the drive unit to output a disconnection drive signal.

4. The method according to claim 3, characterized in that It also includes a trip self-test method implemented by the controller in the power-on self-test stage, where: The controller controls the drive unit to output a disconnection instruction; the controller collects the result of the discrete quantity input unit; the controller reads the trip state; when the controller determines that the result collected by the discrete quantity input unit is on or the read trip state is valid, it determines that there is an interface fault, sets the trip test to fail, ends the trip self-test and locks the interface. Otherwise, the controller configures the duration of the overcurrent state, the controller configures the negative voltage threshold of the D / A conversion unit output, and after a certain time delay, the controller reads the trip state. When the read result is that the trip state is invalid, it sets the trip test to fail, ends the trip self-test and locks the interface. If it is valid, the controller configures the voltage output by the D / A conversion unit to the normal current protection threshold; the controller clears the trip state and clears the energy accumulation value, and then, after a certain time delay, the controller reads the trip state. When the read result is that the trip state is invalid, it sets the trip test to succeed, otherwise it sets the trip test to fail, ends the trip self-test and locks the interface.

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