CN106325348B - Multi-mode electrically operated control method - Google Patents

Abstract

Multi-mode electrically operated control method, belongs to power supply technical field.Solve and how one kind is provided possesses various control pattern, the problem of power control method of accurate temperature controlling can be realized.The multi-mode electrically operated control method of the present invention, first connect equipment, then power configuration file is created in a computer, setting power configuration is simultaneously preserved, power configuration file is read again, judge whether the file format of power configuration file is correct, if incorrect, change power configuration file simultaneously rejudges file format, if correct, programmable power supply is initialized, the control model for judging programmable power supply is power supply open loop control mode, power switch control model or power supply PID control pattern, finally according to the respective control flow control of control model, until power supply terminates.The control method has various control pattern, the power output of firing equipment can be flexibly controlled as needed, so as to obtain the hot-fluid or temperature of needs, is with a wide range of applications in the ground environment experiment of space product.

Description

Multi-mode power control method

technical field

The invention belongs to the technical field of power supply control, in particular to a multi-mode power supply control method, and is especially suitable for power supply control in ground environment tests of aerospace products.

Background technique

The purpose of the ground environment test of aerospace products is to simulate various environments experienced by aerospace products in space and their effects in ground test equipment to test whether aerospace products can withstand the test of these environments and work normally. The ground environmental test of aerospace products is an important link in the development process of aerospace products, in which the accuracy of heat flow simulation and temperature control has an important impact on the reliability and validity of thermal test results. There are many forms of heat flow simulation and temperature control. Among them, constant heat flow simulation and constant temperature control are the most common and critical in thermal testing of aerospace products. The constant heat flow simulation is to provide constant current or voltage to the heating equipment through the programmable power supply, so as to obtain a constant heat flow. Constant temperature control is usually used to simulate the boundary conditions of ground environmental tests, and the boundary of constant temperature is controlled through the adjustment of heat flow, that is, the output power of heating equipment is constantly adjusted. Therefore, at least two power control modes are required in the environmental test of aerospace products to simulate the heat flow and temperature required in the test respectively. However, in the prior art, the ground environment test power supply control mode of aerospace products can only realize a single function, and the application is limited.

In addition, for some aerospace products with stricter temperature requirements, such as space optical remote sensors, precise temperature control must be achieved in ground environmental tests. The conventional closed-loop control mode has a control accuracy of ±1°C, and it is difficult to achieve precise temperature control of ±0.1°C. , therefore, a power control mode with higher temperature control accuracy is required.

To sum up, there is an urgent need for a power control method with multiple control modes and accurate temperature control to meet the thermal test requirements of aerospace products.

Contents of the invention

The technical problem to be solved by the present invention is how to provide a power control method capable of realizing precise temperature control with multiple control modes.

The technical scheme adopted by the present invention to solve the above-mentioned technical problems is as follows.

The multi-mode power supply control method, the steps are as follows:

Step 1. Connect the computer to the switch, and divide the heating equipment into multiple heating zones corresponding to multiple positions of the target equipment that need to be heated. Each heating zone is connected to one end of one or more programmable power supplies. All the programmable power supplies The other end of each is connected to the switch, and a temperature sensor is fixed at each position of the target device that needs to be heated. One end of all temperature sensors is connected to one end of the temperature collector, and the other end of the temperature collector is connected to the switch;

The computer includes a control module, a display module and a power data storage module, and the temperature acquisition instrument includes a temperature data storage module;

Step 2. Create a power configuration file in the computer, set the power configuration and save it;

The power supply configuration includes the power supply IP address, the description of the heating position of the target equipment corresponding to the power supply, the preset current/voltage value, the power supply protection current/voltage, the power supply control mode, the target temperature value, and the storage of the collected temperature value in the temperature data storage module Name, temperature data storage path, power data storage path and PID control parameters;

The power supply control mode is a power supply open-loop control mode, a power switch control mode or a power supply PID control mode;

Step 3. The control module reads the power configuration file, and judges whether the file format of the power configuration file is correct. If it is not correct, the display module prompts the wrong location, and the control module stops working. Go to step 4. If it is correct, the control module controls the initialization of the programmable power supply. Go to step five;

Step 4. Change and save the power configuration file according to the error location prompted, and return to Step 3;

Step 5. The control module judges the control mode of the programmable power supply. If it is a power supply open-loop control mode, perform step 6. If it is a power switch control mode, perform step 7. If it is a power supply PID control mode, perform step 8;

Step 6. Power supply open-loop control mode:

6a. The control module sends the preset current/voltage value to the programmable power supply through the switch;

6b. The program-controlled power supply works according to the instructions, and feeds back the output current and output voltage to the control module through the switchboard;

6c. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power and loop resistance in the power supply data storage module, and controls the display module to display the output of the programmable power supply in real time Voltage, output current, output power and loop resistance;

6d. Return to step 6a until the power control ends;

Step 7. Power switch control mode:

7a. The temperature collector collects the temperature value of the temperature sensor, and stores the collected temperature value in the temperature data storage module;

7b. The control module reads the collected temperature value from the temperature data storage module through the switch, and judges whether the temperature value is higher than the target temperature value. If the judgment result is yes, the control module sends the input current/input voltage with a value of 0 to the switch. For the program-controlled power supply, if the judgment result is no, the control module sends the preset current/voltage value to the program-controlled power supply through the switch;

7c. The program-controlled power supply works according to the instructions, and feeds back the output current and output voltage of the program-controlled power supply to the control module through the switch;

7d. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power and loop resistance in the power supply data storage module, and controls the display module to display the output of the programmable power supply in real time Voltage, output current, output power and loop resistance;

7e. Return to step 7a until the power supply control ends;

Step 8. Power switch control mode:

8a. The temperature collector collects the temperature value of the temperature sensor, and stores the collected temperature value in the temperature data storage module;

8b. The control module reads the collected temperature value from the temperature data storage module through the switch, calculates the difference between the collected temperature value and the target temperature value, calculates the input current/input voltage of the programmable power supply according to the PID calculation formula, and judges the input current/ Whether the input voltage exceeds the protection current/voltage, if not, send the input current/voltage to the program-controlled power supply through the switch, if yes, send the protection current/voltage to the program-controlled power supply through the switch;

8c. The program-controlled power supply works according to the command, and feeds back the output current and output voltage of the program-controlled power supply to the control module through the switchboard;

8d. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power and loop resistance in the power supply data storage module, and controls the display module to display the output of the programmable power supply in real time Voltage, output current, output power and loop resistance;

8e. Return to step 8a until the power supply control ends.

Further, there are multiple computers, and a local area network is formed through the network TCPIP protocol, so that all computers in the local area network can remotely control the work of multiple program-controlled power supplies.

Further, the temperature sensor is a thermocouple, a thermistor or a platinum resistor.

Further, in the step 3, judging whether the file format of the power supply configuration file is correct is: judging whether the intervals between fields are the same and whether the IP address of the power supply is unique, if yes, it is correct, if not, it is incorrect.

Further, in the seventh step, step 7f is also included, the control module calculates the duty cycle.

Further, the control module can call the historical data of a single/multiple programmable power supplies in the power supply data storage module, and control the display module to display historical data curves.

Compared with prior art, the beneficial effect of the present invention is:

The multi-mode power supply control method of the present invention has three control modes, and can flexibly control the output power of the heating device according to different usage requirements, so as to obtain the required heat flow or temperature, and has a wide application prospect in the ground environment test of aerospace products .

Description of drawings

1 is a device connection diagram of step 1 of the multi-mode power supply control method of the present invention;

Fig. 2 is the control flowchart of the multi-mode power supply control method of the present invention;

In the figure, 1. computer, 2. switch, 3. program-controlled power supply, 4. heating device, 5. target device, 6. temperature sensor, 7. temperature acquisition instrument.

detailed description

Further illustrate the present invention below in conjunction with accompanying drawing.

As shown in Figure 1, the multi-mode power supply control method of the present invention, the steps are as follows:

Step 1, as shown in Figure 1, connect the equipment: connect the computer 1 to the switch 2 through the second type of network cable, divide the heating equipment 4 into a plurality of heating zones corresponding to the positions of the target equipment 5 that need to be heated one by one, Each heating zone is connected to one end of one or more programmable power supplies 3 through copper wires, and the other ends of all programmable power supplies 3 are connected to the switch 2 through a second-type network cable, and a temperature is fixed at each position of the target device 5 that needs to be heated Sensor 6, one end of all temperature sensors 6 is all connected with one end of temperature acquisition instrument 7 by temperature sensor wiring, and the other end of temperature acquisition instrument 7 is connected with switch 2 by second type network cable;

Wherein, the computer 1 includes a control module, a display module and a power supply data storage module; if there are multiple computers 1, the network TCPIP protocol can be used to form a local area network, so that all computers in the local area network can remotely control the work of multiple programmable power supplies 3 . The program-controlled power supply 3 can use Agilent's N5700 series high-precision program-controlled DC power supply, and the current output accuracy can reach 0.02A. The gauge of the copper wire may be 0.35mm ² . The target device 5 is placed in the heating device 4 and can be in contact with the heating device 4, that is, the heating device 4 is arranged on the surface of the target device 5, or not in contact with the heating device 4, that is, the target device 5 is placed in the space formed by the heating device 4 Inside. The type of the temperature sensor 6 is not limited, and may be a thermocouple, a thermistor or a platinum resistor. The temperature acquisition instrument 7 includes a temperature data storage module.

Step 2. Create a power configuration file in computer 1, set the power configuration and save it;

The power configuration file is the input file of the control module, and it is the only input file, which affects the entire control method. The power configuration file often uses a power configuration table, which specifically includes the IP address of the power supply, the description of the heating position of the target device 5 corresponding to the power supply, and the preset current/ Voltage value, power supply protection current/voltage, power supply control mode, target temperature value, storage name of the collected temperature value in the temperature data storage module, temperature data storage path, power supply data storage path, PID control parameters, etc.;

Among them, the IP address of the power supply can be set according to the needs, but its uniqueness must be guaranteed. The protection current/voltage of the power supply is determined by the performance of the power supply itself. The preset current/voltage value is calculated by those skilled in the art according to the heat balance formula. The preset current The /voltage value and the target temperature value do not exceed the power supply protection current/voltage, the name of the collected temperature value in the temperature data storage module, the temperature data storage path and the power supply data storage path are set according to the needs, and the PID control parameters are Kp, Ki, Kd , those skilled in the art can obtain in a well-known manner, and the power control mode is selected according to needs. It should be noted that the power supply configuration has a corresponding relationship according to the hardware connection, that is, after the IP address of the power supply is determined, the description of the heating position of the target device 5 corresponding to the power supply is the heating position of the target device 5 corresponding to the power supply of the IP address, and the preset current/voltage The value is the preset current/voltage value of the heating position of the target device 5 corresponding to the power supply of the IP address, the power protection current/voltage is the protection current of the power supply of the IP address, and the power control mode is the power supply of the IP address. The control mode required by the heating position of the corresponding target device 5, the target temperature value is the target temperature value of the heating position of the target device 5 corresponding to the power supply of the IP address, and the storage name of the collected temperature value in the temperature data storage module is The storage name of the temperature of the temperature sensor 6 at the heating position of the target device 5 corresponding to the power supply of the IP address collected by the temperature acquisition instrument 7 in the temperature data storage module, and the PID control parameter is the PID control of the target device 5 heating position parameter;

Step 3. The control module reads the power configuration file and judges whether the file format of the power configuration file is correct, usually by judging whether the intervals between fields are the same (if they are all 2 spaces, if yes, then it is correct, if not, then no Correct, the judgment is to ensure that the control module reads the power supply configuration file completely) and whether the IP address of the power supply is unique (if it is unique, it is correct, if it is not unique, it is incorrect), if it is not correct, the control module controls the display module to prompt the wrong location , the control module stops working, proceed to step 4, if correct, the control module controls the initialization of the programmable power supply 3, proceed to step 5;

Step 4. Change and save the power configuration file according to the error location prompted, and return to Step 3;

Step five, the control module judges the control mode of the program-controlled power supply 3, determines mode 0, mode 1 or mode 2, if it is mode 0, execute step six, if it is mode 1, execute step seven, if it is mode 2, execute step eight;

Step 6. Mode 0 is the open-loop control mode of the power supply. The open-loop control of the power supply is a single current/voltage control, and the control result is not fed back. The specific process is:

6a. The control module sends the preset current/voltage value to the programmable power supply 3 via the switch 2;

6b. The program-controlled power supply 3 works according to the instructions, and feeds back the output current and output voltage to the control module through the switch 2;

6c. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power and loop resistance in the power supply data storage module, and controls the display module to display the real-time value of the programmable power supply 3 Output voltage, output current, output power and loop resistance;

6d. Return to step 6a until the power supply control ends.

Step 7. Mode 1 is the power switch control mode. The power switch control mode is a kind of closed-loop control. Closed-loop control is about feeding back the control result and comparing it with the set value, and adjusting the control function according to their comparison value. The power switch control mode is to compare the feedback temperature measurement result with the target temperature value to control whether the power supply works. The specific control process is as follows:

7a. The temperature collector 7 collects the temperature value of the temperature sensor 6, and stores the collected temperature value in the temperature data storage module;

7b. The control module reads the collected temperature value from the temperature data storage module through the switch 2, and judges whether the temperature value is higher than the target temperature value. If the judgment result is yes, the control module sends the input current/voltage with a value of 0 to the switch through the switch. 2 to send to the program-controlled power supply 3, that is, the program-controlled power supply 3 does not work, if the judgment result is no, the control module sends the preset current/voltage value to the program-controlled power supply 3 via the switch 2;

7c. The program-controlled power supply 3 works according to the instruction, and feeds back the output current and output voltage of the program-controlled power supply 3 to the control module through the switch 2;

7d. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power, and loop resistance in the power supply data storage module, and controls the display module to display the real-time value of the programmable power supply 3 Output voltage, output current, output power and loop resistance;

7e. Return to step 7a until the power supply control ends.

In this control mode, step 7f may also be included, the control module calculates the duty cycle, that is, calculates the ratio of the power-on time to the entire time within a specified period of time, expressed as a percentage, and the required data is directly read from the power data storage module .

Step 8. Mode 2 is the PID control mode of the power supply. The PID control of the power supply is a kind of closed-loop control. It gradually adjusts the output current/voltage of the power supply according to the difference between the temperature measurement result fed back and the target temperature value, so as to achieve accurate The purpose of temperature control, the specific control process is:

8a. The temperature collector 7 collects the temperature value of the temperature sensor 6, and stores the collected temperature value in the temperature data storage module;

8b. The control module reads the collected temperature value from the temperature data storage module via the switch 2, calculates the difference between the collected temperature value and the target temperature, calculates the input current/input voltage of the programmable power supply 3 according to the PID calculation formula, and judges the input current /Whether the input voltage exceeds the protection current/voltage, if not, send the input current/input voltage to the program-controlled power supply 3 through the switch 2, if yes, send the protection current/voltage to the program-control power supply 3 through the switch 2;

8c. The program-controlled power supply 3 works according to the instruction, and feeds back the output current and output voltage of the program-controlled power supply 3 to the control module through the switch 2;

8d. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power and loop resistance in the power supply data storage module, and controls the display module to display the real-time value of the programmable power supply 3 Output voltage, output current, output power and loop resistance;

8e. Return to step 8a until the power supply control ends.

In the actual control process of the present invention, according to specific needs, one position control for the target device 5 can be selected, and multiple position controls for the target device 5 can also be selected. But for the control of each position of the target device 5, the heating zone of the heating device 4 for heating, the programmable power supply 3 connected to the heating zone of the heating device 4, the temperature sensor 6 that senses its temperature, and the IP address of the power supply , preset current/voltage value, power supply protection current, power supply control mode, target temperature value, name of the collected temperature value in the temperature data storage module, and PID control parameters are all corresponding.

In the actual control process of the present invention, the data of the program-controlled power supply 3 displayed by the display module can be selected according to actual needs. It can display the output voltage, output current, output power and loop resistance of a program-controlled power supply 3, or display multiple The output voltage, output current, output power and loop resistance of the programmable power supply 3 are controlled.

In the present invention, the control module can control the display module to display historical curves. The historical curve display is based on the power data storage module, and directly reads historical data in a specified time period from the power data storage module (such as using a LabSQL database access tool to read ) and displayed in the form of a curve, intuitively reflecting the change process of the output voltage, output current, output power, and loop resistance of a single/multiple programmable power supplies 3 .

In the present invention, the calculation of the loop resistance is mainly used for comparison with the loop resistance measured in the preparation stage, which is convenient for the operator to judge whether there is a short circuit/open circuit phenomenon in the heating circuit, the measurement of the loop resistance value and the judgment of the short circuit/open circuit in the preparation stage It is a technique well known to those skilled in the art.

Claims (6)

1. The multi-mode power supply control method is characterized in that the steps are as follows: Step 1. Connect the computer (1) to the switch (2), and divide the heating device (4) into a plurality of heating zones corresponding to multiple positions of the target device (5) that need to be heated. Each heating zone is connected to a or multiple programmable power supplies (3), the other ends of all programmable power supplies (3) are connected to the switchboard (2), and a temperature sensor (6) is fixed at each position of the target device (5) that needs to be heated. One end of the temperature sensor (6) is all connected with one end of the temperature acquisition instrument (7), and the other end of the temperature acquisition instrument (7) is connected with the switchboard (2); The computer (1) includes a control module, a display module and a power supply data storage module, and the temperature acquisition instrument (7) includes a temperature data storage module; Step 2, create a power configuration file in the computer (1), set the power configuration and save it; The power supply configuration includes power supply IP address, power supply corresponding target device (5) heating position description, preset current/voltage value, power supply protection current/voltage, power supply control mode, target temperature value, and collected temperature value in the temperature data storage module The storage name, temperature data storage path, power data storage path and PID control parameters in ; The power supply control mode is a power supply open-loop control mode, a power switch control mode or a power supply PID control mode; Step 3. The control module reads the power configuration file, and judges whether the file format of the power configuration file is correct. If it is incorrect, the display module prompts the wrong location, and the control module stops working. Go to step 4. If it is correct, the control module controls the program-controlled power supply (3 ) initialization, proceed to step five; Step 4. Change and save the power configuration file according to the error location prompted, and return to Step 3; Step 5, the control module judges the control mode of the programmable power supply (3), if it is a power supply open-loop control mode, perform step 6, if it is a power switch control mode, perform step 7, if it is a power supply PID control mode, perform step 8; Step 6. Power supply open-loop control mode: 6a. The control module sends the preset current/voltage value to the programmable power supply (3) via the switch (2); 6b. The program-controlled power supply (3) works according to the command, and feeds back the output current and output voltage to the control module through the switch (2); 6c. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power and loop resistance in the power supply data storage module, and controls the display module to display the programmable power supply in real time (3 ) output voltage, output current, output power and loop resistance; 6d. Return to step 6a until the power control ends; Step 7. Power switch control mode: 7a. The temperature collector (7) collects the temperature value of the temperature sensor (6), and stores the collected temperature value into the temperature data storage module; 7b. The control module reads the collected temperature value from the temperature data storage module via the switch (2), and judges whether the temperature value is higher than the target temperature value. Send to the program-controlled power supply (3) through the switch (2), if the judgment result is no, the control module sends the preset current/voltage value to the program-controlled power supply (3) through the switch (2); 7c. The program-controlled power supply (3) works according to the instructions, and feeds back the output current and output voltage of the program-controlled power supply (3) to the control module through the switch (2); 7d. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power, and loop resistance in the power supply data storage module, and controls the display module to display the programmable power supply in real time (3 ) output voltage, output current, output power and loop resistance; 7e. Return to step 7a until the power supply control ends; Step 8. Power supply PID control mode: 8a. The temperature collector (7) collects the temperature value of the temperature sensor (6), and stores the collected temperature value into the temperature data storage module; 8b. The control module reads the collected temperature value from the temperature data storage module via the switch (2), calculates the difference between the collected temperature value and the target temperature value, and calculates the input current/input voltage of the programmable power supply (3) according to the PID calculation formula , judge whether the input current/input voltage exceeds the protection current/voltage, if not, send the input current/input voltage to the programmable power supply (3) through the switchboard (2), if yes, send the protection current/voltage through the switchboard (2) ) is sent to the program-controlled power supply (3); 8c. The program-controlled power supply (3) works according to the instructions, and feeds back the output current and output voltage of the program-controlled power supply (3) to the control module through the switch (2); 8d. The control module calculates the output power and loop resistance according to the feedback output current and output voltage, stores the output voltage, output current, output power and loop resistance in the power supply data storage module, and controls the display module to display the programmable power supply in real time (3 ) output voltage, output current, output power and loop resistance; 8e. Return to step 8a until the power supply control ends. 2. The multi-mode power supply control method according to claim 1, characterized in that, there are multiple computers (1), and a local area network is formed through the network TCPIP protocol, so that all computers (1) in the local area network can remotely control multiple A programmable power supply (3) works. 3. The multi-mode power supply control method according to claim 1, characterized in that the temperature sensor (6) is a thermocouple type, a thermistor type or a platinum resistance type. 4. The multi-mode power supply control method according to claim 1, characterized in that, in said step 3, judging whether the file format of the power supply configuration file is correct is: judging whether the interval between the field and the field is the same and the IP address of the power supply Whether it is unique, if yes, it is correct, if not, it is incorrect. 5 . The multi-mode power supply control method according to claim 1 , wherein the step 7 further includes step 7f, wherein the control module calculates the duty cycle. 6. multi-mode power supply control method according to claim 1, is characterized in that, described control module can call the historical data of single/multiple programmable power supply (3) in the power supply data storage module, control display module shows historical data curve .