Parallel power supply power balancing method based on programmable power supplies

Abstract

The invention discloses a parallel power supply power balancing method based on programmable power supplies, and the method comprises the steps: calibrating the output voltage precision of N programmable power supplies, and enabling the programmable power supplies to achieve the precise output; the method comprises the following steps: setting output voltage UOn of N programmable power supplies, an output voltage adjustment step value U of the programmable power supplies and an allowable imbalance degree A among the programmable power supplies through upper computer software, and outputting UOn; collecting an output voltage Ui and an output current Ii of each programmable power supply, and calculating an actual output power Pi of each programmable power supply and an expected output power P of each programmable power supply; and calculating a power deviation value between the actual output power Pi and the expected output power Paverage, and dynamically adjusting the real-time output voltage of the programmable power supply through a balanced power algorithm. According to the invention, control and adjustment are carried out by means of upper computer software, hardware cost does not need to be increased, the number of equalization power programmable power supplies can be adjusted at will, and overall power equalization failure caused by failure of a single power supply is avoided.

Description

Technical Field

[0001] This invention belongs to the field of aerospace technology, specifically relating to a power balancing method based on parallel power supply of programmable power supplies. Background Technology

[0002] During integrated ground testing of large aircraft, the reliability and stability of the power supply system are crucial to ensuring the smooth commissioning and testing of the entire system. Currently, such tests often employ multiple parallel programmable power supplies to provide sufficient current and power output. However, in practical engineering applications, differences in the length and cross-sectional area of ​​the connecting cables between the output terminals of each power supply and the load can lead to unbalanced impedance of the loop cables, resulting in uneven power distribution among the power supply modules, and consequently, power overload or reduced efficiency. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a power balancing method based on parallel power supply of programmable power supplies. This method dynamically balances the output power of each power supply through a control algorithm. The steps of the method are as follows:

[0004] S1. The output voltage and current acquisition accuracy of N programmable power supplies are calibrated using the calibration system and host computer software, and the calibrated output voltage and current values ​​of each programmable power supply are recorded.

[0005] S2, Set the output voltage U of N programmable power supplies in the host computer software. On The output voltage adjustment step value ΔU of the programmable power supply and the allowable imbalance A between programmable power supplies are specified, and the output voltage U is set accordingly. On ;

[0006] S3, The host computer software collects the output voltage U of each programmable power supply in real time. i Output current I i ;

[0007] S4. Based on the collected output voltage U i Output current I i Calculate the actual output power P of each programmable power supply. i And the expected output power P of each programmable power supply 均 ;

[0008] S5. Determine if the current programmable power supply is working properly.

[0009] If the programmable power supply is working properly, proceed to step S6;

[0010] If the programmable power supply malfunctions, an error will be reported and the process will end.

[0011] S6. Determine the acquired output voltage U i Is the value in U?On ±0.1V

[0012] If U On -0.1V≤U i ≤U On +0.1V, then step S7 is performed;

[0013] If U i >U On +0.1V or U i <U On -0.1V, then an error is reported, and the process ends;

[0014] S7, the host computer software calculates the actual output power P i and the power deviation value of the expected output power P 均 , dynamically adjusts the real-time output voltage of the program-controlled power supply through the equalization power algorithm, synchronously adjusts the output voltage of each power supply, so that the highest output voltage does not exceed the set voltage;

[0015] S8, repeat steps S3-S7, and after several cycles, the output power deviation value of each program-controlled power supply is controlled within the set range, and the output power of each program-controlled power supply is balanced.

[0016] The step S1 is used to improve the initial output accuracy of the program-controlled power supply, so that the equalization software can make the power reach balance faster;

[0017] The N program-controlled power supplies are connected in parallel, and each program-controlled power supply has an independent sampling loop;

[0018] The N program-controlled power supplies interact with the host computer software, including voltage collection, current collection, program-controlled power supply output voltage control, for real-time monitoring of the running state of the N program-controlled power supplies;

[0019] Specifically, the calibration system in step S1 includes a calibration box, a calibrated six-and-a-half digit multimeter, and an electronic load.

[0020] The calibration box is connected with the N program-controlled power supplies, and the other end is connected with the electronic load; one end of the calibrated six-and-a-half digit multimeter is connected with the host computer through the RS-232 interface, and the other end is connected with the calibration box.

[0021] The host computer software is connected with the N program-controlled power supplies;

[0022] When the calibration box switch is in the open circuit position, the electronic load is not connected to the circuit, and the host computer software starts voltage calibration;

[0023] When the calibration box switch is in the closed state, the electronic load is connected to the circuit, and the host computer software starts current collection calibration;

[0024] In the step S1, the calibration method is as follows:

[0025] S1-1, in the same calibration box, the positive poles of N programmable power supplies are connected together, the negative poles of N programmable power supplies are connected together, each programmable power supply is independently controlled, and only one programmable power supply is calibrated each time;

[0026] S1-2, the voltage calibration is performed through the calibration algorithm of the upper computer software;

[0027] The voltage calibration includes output voltage and acquisition voltage calibration;

[0028] The upper computer software prompts the user to confirm whether the switch on the calibration box is in the voltage position, and after confirmation, the output voltage calibration is performed first, and then the acquisition voltage calibration is performed;

[0029] S1-3, the current calibration is performed through the calibration algorithm of the upper computer software;

[0030] After the step S1-2 is completed, the upper computer software will prompt the user to switch the switch to the current position, and continue after confirmation.

[0031] S1-4, after the voltage and current calibration is completed, the upper computer software generates a record file that can be printed and saved;

[0032] The algorithm of the voltage calibration in the step S1-2 is as follows:

[0033] A1, the upper computer software inputs several known voltage values y0, y1, y2……y n to the programmable power supply, and the output results of the programmable power supply are measured by the calibrated six-and-a-half digit multimeter as x0, x1, x2……x n ;

[0034] A2, according to the values of y0, y1 and x0, x1 and the difference principle, the difference equation is obtained as:

[0035]

[0036]

[0037] A3, according to the obtained values of a0 and a1, the voltage values y2 and y3 are corrected;

[0038] A4, the corrected voltage values y2 and y3 are input to the calibrated six-and-a-half digit multimeter again to obtain x2 and x3, the deviation value of y2 and x2 is detected, if the deviation value exceeds the design value, a2 and a3 are calculated, and so on, until the deviation between the corrected power supply input voltage and the calibrated six-and-a-half digit multimeter is less than the design value. ​

[0039] The algorithm for current calibration in steps S1-3 is based on the same principle as the algorithm for voltage calibration.

[0040] The power equalization algorithm in step S7 is based on the actual output power P. i With expected output power P 均 The power deviation value is used to determine the output voltage U of the control power supply. i Check if the value is within ±A. If it is not within ±A, then the output voltage U of each programmable power supply needs to be dynamically adjusted synchronously. i Ensure that its maximum output voltage does not exceed the set voltage U. On After several adjustments, the actual output power P of each programmable power supply was... i With expected output power P 均 The power deviation will be controlled within ±A, thereby achieving balanced output power of each programmable power supply.

[0041] The synchronous dynamic adjustment of the output voltage U of each programmable power supply i The specific methods are as follows:

[0042] If P i -P 均 >A indicates that the output voltage U of the programmable power supply i If it is too high, reduce the output voltage value U. i to U i -△U, to reduce its output power;

[0043] If P i -P 均 <-A indicates that the output voltage U of the programmable power supply is... i If it's too low, increase the output voltage value U. i toU i +△U, to increase its output power;

[0044] If -A≤P i -P 均 If ≤A, then maintain the output voltage U. i constant;

[0045] Key constraint: Maximum output voltage (maxU) of all power supplies after adjustment. i ≤U On To avoid exceeding voltage limits.

[0046] The voltage adjustment step value ΔU is the programmable resolution of the programmable power supply.

[0047] This invention is applicable to various types of programmable power supplies. It achieves automatic closed-loop control of power balance through host computer software, and there are no restrictions on the impedance requirements between the sampling point and the electronic load.

[0048] Compared with the prior art, the present application has the following beneficial effects:

[0049] The present application provides a power balancing method based on programmable power supply parallel power supply, wherein the number of balanced power programmable power supply can be arbitrarily adjusted, effectively avoiding the situation that the overall power balance fails when a single power supply fails; and this method mainly relies on the control and adjustment of the upper computer software, without increasing the hardware cost of the entire power supply circuit, further improving the stability and safety of power supply. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0051] Figure 1 A functional block diagram of the power balancing method based on programmable power supply provided by the present application is provided.

[0052] Figure 2 A calibration connection diagram of the power balancing method based on programmable power supply provided by the present application is provided.

[0053] Figure 3 A power balancing control flowchart of the power balancing method based on programmable power supply provided by the present application is provided. DETAILED DESCRIPTION

[0054] The present application will be described in detail below in combination with specific embodiments. The following embodiments are helpful for those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the concept of the present application. These all belong to the protection scope of the present application.

[0055] As shown in Figure 1 A power balancing method based on programmable power supply parallel power supply, which dynamically balances the output power of each power supply through a control algorithm, the method steps are as follows:

[0056] S1, calibrate the output voltage, collected voltage and collected current accuracy of N programmable power supplies through a calibration system and upper computer software, and record the calibrated output voltage value and collected current value of each programmable power supply;

[0057] S2, the upper computer software sets the output voltage U On of N programmable power supplies, the output voltage adjustment step value ΔU of programmable power supply and the allowable imbalance degree A between programmable power supplies, and outputs UOn ;

[0058] S3, The host computer software collects the output voltage U of each programmable power supply in real time. i Output current I i ;

[0059] S4. Based on the collected output voltage U i Output current I i Calculate the actual output power P of each programmable power supply. i And the expected output power P of each programmable power supply 均 ;

[0060] S5. Determine if the current programmable power supply is working properly. If the programmable power supply is working properly, proceed to step S6; if the programmable power supply is malfunctioning, report an error and end the process.

[0061] S6. Determine the acquired output voltage U i Is the value in U? On Within the range of ±0.1V, if U On -0.1V≤U i ≤U On +

[0062] If U = 0.1V, proceed to step S7; if U = 0.1V, proceed to step S7. i >U On +0.1V or U i <U On If the value is -0.1V, an error will be reported and the process will end.

[0063] S7, The host computer software calculates the actual output power P. i With expected output power P 均 The power deviation value is dynamically adjusted by the power balancing algorithm to adjust the real-time output voltage of the programmable power supply.

[0064] S8. Repeat steps S3 to S7. After several cycles, the output power deviation of each programmable power supply is controlled within the set range, so as to achieve balanced output power of each programmable power supply.

[0065] like Figure 2 As shown, the calibration system in step S1 includes a calibration box, a calibrated six-and-a-half-digit multimeter, and an electronic load;

[0066] The calibration box is connected to N programmable power supplies, and the other end is connected to the electronic load; one end of the calibrated six-and-a-half-digit multimeter is connected to the host computer via an RS-232 interface, and the other end is connected to the calibration box;

[0067] The host computer software is connected to N programmable power supplies;

[0068] When the switch of the calibration box is in the open circuit position, the electronic load is not connected to the circuit, and the host computer software starts voltage calibration, which includes output voltage and acquisition voltage calibration;

[0069] When the switch of the calibration box is in the current position, the electronic load is connected to the circuit, and the host computer software starts acquisition current calibration.

[0070] In step S1, the calibration method is as follows:

[0071] S1-1, in the same calibration box, the positive poles of N programmable power supplies are connected together, and the negative poles of N programmable power supplies are connected together, each programmable power supply is independently controlled, and only one programmable power supply is calibrated each time;

[0072] S1-2, through the calibration algorithm of the host computer software, voltage calibration is carried out;

[0073] The voltage calibration includes output voltage and acquisition voltage calibration;

[0074] The host computer software prompts the user to confirm whether the switch of the calibration box is in the voltage position, and after confirmation, the output voltage calibration is carried out first, and then the acquisition voltage calibration is carried out;

[0075] S1-3, through the calibration algorithm of the host computer software, current calibration is carried out;

[0076] After completing step S1-2, the host computer software will prompt the user to switch the switch to the current position, and continue after confirmation;

[0077] S1-4, after voltage and current calibration, the host computer software generates a record file that can be printed and saved.

[0078] As Figure 3 The output voltage of the calibrated programmable power supply and the measured deviation of the calibrated multimeter are less than 20mV; the deviation between the power supply acquisition voltage value and the multimeter measurement value is less than 20mV; the deviation between the power supply acquisition current value and the multimeter measurement value is less than 40mA;

[0079] Each programmable power supply has a rated output voltage of 0-150V, a rated output current of 0-50A, and a rated power of 7.5kW;

[0080] Four power supplies jointly supply power to the load, and the programmable power supply measurement feedback point is at the load input measurement short circuit;

[0081] The load requires an input voltage of 100V, a load power of 0W-14kW, and the power supply cables of power supplies 1-3 are consistent in length, and the power supply cable of power supply 4 is longer than those of the other three power supplies.

[0082] Example 1: 4 programmable power supplies are connected in parallel to supply power to the electronic load, and the output voltage U of the programmable power supply is set to 100V On The output voltage adjustment step of the programmable power supply is 0.01V, and the allowable imbalance A between the programmable power supplies is 5%, and the output voltage U of the programmable power supply is 100V On 100V;

[0083] When the power of the electronic load is 10kW, the total output power of the 4 programmable power supplies is collected by the host computer software, and the expected output power P of each programmable power supply is calculated 均 2.5kW, according to the actual output power P i and the expected output power P 均 The adjusted output voltage of the power supply is calculated, and the maximum output voltage of the programmable power supply is ensured to be equal to the set output voltage of the programmable power supply 100V;

[0084] After several cycles, the output power imbalance of each programmable power supply is less than 5%, and the output voltage of each programmable power supply is maintained; when the load power changes and causes the output power imbalance of the programmable power supply to be greater than 5%, the output voltage of each programmable power supply is recalculated, so as to achieve real-time power balance state.

[0085] Example 2: When 4 programmable power supplies are connected in parallel to supply power to the load, any one of the programmable power supplies fails, and the host computer software recognizes the power supply failure information, corrects the number of power supplies participating in power balance, and closes the output of the failed power supply;

[0086] When the load power is 10kW, the total output power of the 4 programmable power supplies is collected by the host computer, and the expected output power P of each programmable power supply is 3.3kW, according to the actual output power P 均 of the 3 programmable power supplies collected in real time i and the expected output power P 均 , adjust the output voltage of the 3 programmable power supplies, and ensure that the maximum output voltage of the programmable power supply is equal to the set output voltage of the programmable power supply 100V;

[0087] As Figure 1 , after several cycles, the output power imbalance of each programmable power supply is less than 5%, and the output voltage of the 3 programmable power supplies is maintained; when the load power changes and causes the output power imbalance of the programmable power supply to be greater than 5%, the output voltage of the 3 programmable power supplies is recalculated, so as to achieve real-time power balance state.

[0088] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make possible variations and modifications to the technical solutions of the present invention using the disclosed methods and techniques without departing from the spirit and scope of the invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the invention's technical solutions are within the protection scope of the present invention. Content not described in detail in this specification is common knowledge to those skilled in the art.

Claims

1. A power balancing method based on parallel power supply of programmable power supplies, characterized in that: The method involves dynamically balancing the output power of each power supply using a control algorithm, and the steps are as follows: S1. The output voltage and current acquisition accuracy of N programmable power supplies are calibrated using the calibration system and host computer software, and the calibrated output voltage and current values ​​of each programmable power supply are recorded. S2, Set the output voltage U of N programmable power supplies in the host computer software. On The output voltage adjustment step value ΔU of the programmable power supply and the allowable imbalance A between programmable power supplies are specified, and the output voltage U is set accordingly. On ; S3, The host computer software collects the output voltage U of each programmable power supply in real time. i Output current I i ; S4. Based on the collected output voltage U i Output current I i Calculate the actual output power P of each programmable power supply. i And the expected output power P of each programmable power supply 均 ; S5. Determine if the current programmable power supply is working properly. If the programmable power supply is working properly, proceed to step S6; If the programmable power supply malfunctions, an error will be reported and the process will end. S6. Determine the acquired output voltage U i Is the value in U? On Within ±0.1V If U On -0.1V≤U i ≤U On If the value is +0.1V, proceed to step S7; If U i >U On +0.1V or U i <U On If the value is -0.1V, an error will be reported and the process will end. S7, The host computer software calculates the actual output power P. i With expected output power P 均 The power deviation value is dynamically adjusted by the power balancing algorithm to adjust the real-time output voltage of the programmable power supply. S8. Repeat steps S3 to S7. After several cycles, the output power deviation of each programmable power supply is controlled within the set range, so as to achieve balanced output power of each programmable power supply.

2. The power balancing method based on parallel power supply of a programmable power supply according to claim 1, characterized in that: The calibration system described in step S1 includes a calibration box, a calibrated 6.5-digit multimeter, and an electronic load; The calibration box is connected to N programmable power supplies, and the other end is connected to the electronic load; one end of the calibrated six-and-a-half-digit multimeter is connected to the host computer via an RS-232 interface, and the other end is connected to the calibration box; The host computer software is connected to N programmable power supplies; When the calibration box switch is in the open circuit position, the electronic load is not connected to the circuit, and the host computer software starts voltage calibration. When the calibration box switch is in the closed state, the electronic load is connected to the circuit, and the host computer software begins to collect current for calibration.

3. The power balancing method based on parallel power supply of a programmable power supply according to claim 1, characterized in that: The method for calibrating the output voltage and current acquisition accuracy of N programmable power supplies using a calibration system and host computer software in step S1 is as follows: S1-1. In the same calibration box, connect the positive terminals of N programmable power supplies together and connect the negative terminals of N programmable power supplies together. Each programmable power supply is controlled independently, and only one programmable power supply is calibrated at a time. S1-2. Perform voltage calibration using the calibration algorithm of the host computer software; The voltage calibration includes the calibration of the output voltage and the acquired voltage; The host computer software prompts the user to confirm whether the switch on the calibration box is in the voltage position. After confirmation, the output voltage is calibrated first, and then the acquisition voltage is calibrated. S1-3. Perform current calibration using the calibration algorithm of the host computer software; After completing steps S1-2, the host computer software will prompt the user to switch the switch to the current position, and continue after receiving confirmation; S1-4. After completing the voltage and current calibration, the host computer software generates a file that records the calibrated voltage and current. This file can be saved and printed.

4. The power balancing method based on parallel power supply of a programmable power supply according to claim 3, characterized in that: The voltage calibration algorithm in step S1-2 is as follows: A1. The host computer software inputs several known voltage values ​​y0, y1, y2...y n The output of the programmable power supply was measured using a calibrated 6.5-digit multimeter, and the values ​​were x0, x1, x2...x n ; A2. Based on the values ​​of y0, y1, x0, and x1, and using the difference principle, the difference equation is: get ; A3. Based on the obtained values ​​of a0 and a1, correct the voltage values ​​y2 and y3; A4. Input the corrected voltage values ​​y2 and y3 back into the programmable power supply. Obtain x2 and x3 using a calibrated six-and-a-half-digit multimeter. Check the deviation between y2 and x2. If it exceeds the design value, continue to calculate a2 and a3. Continue in this manner until the deviation between the corrected power supply input voltage and the measurement of the calibrated six-and-a-half-digit multimeter is less than the design value. The algorithm for current calibration in steps S1-3 is based on the same principle as the algorithm for voltage calibration.

5. The power balancing method based on parallel power supply of a programmable power supply according to claim 1, characterized in that: The power equalization algorithm described in step S7 is based on the actual output power P. i With expected output power P 均 The power deviation value is used to determine the output voltage U of the control power supply. i Check if the value is within ±A. If it is not within ±A, then the output voltage U of each programmable power supply needs to be dynamically adjusted synchronously. i Ensure that its maximum output voltage does not exceed the set voltage U. On After several adjustments, the actual output power P of each programmable power supply was... i With expected output power P 均 The power deviation will be controlled within ±A range, thereby achieving balanced output power for each programmable power supply.

6. The power balancing method based on parallel power supply of a programmable power supply according to claim 5, characterized in that: The synchronous dynamic adjustment of the output voltage U of each programmable power supply i The specific methods are as follows: like This indicates that the output voltage U of the programmable power supply i If it is too high, reduce the output voltage value U. i toU i -△U, to reduce its output power; like This indicates that the output voltage U of the programmable power supply i If it's too low, increase the output voltage value U. i toU i + △U, to increase its output power; like Then maintain the output voltage U i constant; Key constraint: Maximum output voltage of all power supplies after adjustment To avoid exceeding voltage limits.

7. The power balancing method based on parallel power supply of a programmable power supply according to claim 1, characterized in that: The N programmable power supplies are connected in parallel, and each programmable power supply has an independent sampling circuit.

8. The power balancing method based on parallel power supply of a programmable power supply according to claim 1, characterized in that: The N programmable power supplies interact with the host computer software, including voltage acquisition, current acquisition, and output voltage control of the programmable power supplies, to monitor the operating status of the N programmable power supplies in real time.

9. A power balancing method based on parallel power supply of a programmable power supply according to claim 1, characterized in that: The power balancing method described herein is applicable to all types of programmable power supplies. Automatic closed-loop control of power balancing is achieved through host computer software, and there are no restrictions on the impedance requirements between the sampling point and the electronic load.

10. A power balancing method based on parallel power supply of a programmable power supply according to claim 1, characterized in that: The voltage adjustment step value ΔU mentioned in step S2 is the programmable resolution of the programmable power supply.

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