Output voltage adjusting method and adjusting system based on battery electric quantity

Abstract

The invention discloses an output voltage regulation method and regulation system based on battery electric quantity, and the method comprises the following steps: 1, determining a regulation voltage value according to a preset voltage value and a current output voltage value of a voltage conversion circuit; step 2, acquiring an actual voltage value output by the power supply and a fundamental current value under the working frequency in real time, and determining a maximum output voltage value of the voltage conversion circuit; 3, based on a preset first calculation formula, according to the fundamental wave current value, the basic parameters of the step-up transformer and the basic parameters of the step-down transformer, a dynamic voltage drop is obtained, and according to the actual voltage value and the dynamic voltage drop, a first pulse width is obtained through calculation; step 4, calculating a second pulse width based on a preset second calculation formula according to the dynamic voltage drop and the first pulse width; generating a PWM (Pulse Width Modulation) control signal of which the pulse width is a second pulse width, and adjusting the output of the power supply by utilizing the PWM control signal; the stability of the output voltage is improved, and meanwhile the output voltage is correspondingly protected.

Description

Technical Field

[0001] The present invention relates to the technical field of output voltage regulation, and in particular to an output voltage regulation method and a regulation system based on battery power. Background Art

[0002] As we all know, with the development of power electronic conversion technology, voltage conversion circuits have become an indispensable part of electronic equipment. Voltage conversion circuits can convert input DC voltages into different DC voltages required by electronic equipment. Voltage conversion is a common technology in power systems and electronic circuits, mainly used to adjust voltage levels to meet the needs of different devices and applications. However, the existing voltage conversion has poor stability, and it is impossible to protect the output voltage during the voltage conversion process, which reduces the stability of the voltage conversion. Therefore, we propose an output voltage regulation method and regulation system based on battery power to solve the above-mentioned problems. Summary of the invention

[0003] The object of the present invention is to provide an output voltage regulation method and regulation system based on battery power, so as to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] The output voltage regulation method based on battery power includes the following steps:

[0006] Step 1: Determine the adjustment voltage value according to the preset voltage value and the current output voltage value of the voltage conversion circuit;

[0007] Step 2: Collect the actual voltage value of the power supply output and the fundamental current value at the operating frequency in real time to determine the maximum output voltage value of the voltage conversion circuit;

[0008] Step 3: Based on a preset first calculation formula, a dynamic voltage drop is obtained according to the fundamental current value, basic parameters of the step-up transformer, and basic parameters of the step-down transformer, and a first pulse width is calculated according to the actual voltage value and the dynamic voltage drop;

[0009] Step 4: Based on a preset second calculation formula, a second pulse width is calculated according to the dynamic voltage drop and the first pulse width; a PWM control signal with a pulse width of the second pulse width is generated, and the output of the power supply is adjusted using the PWM control signal.

[0010] As a further solution of the present invention: the step 1 determines the adjustment voltage value according to the preset voltage value and the current output voltage value of the voltage conversion circuit, including: performing a proportional differential operation on the difference between the preset voltage value and the current output voltage value of the voltage conversion circuit to obtain a proportional differential voltage value; performing a feedforward operation on the preset voltage value to obtain a feedforward voltage value, and performing a compensation operation on the preset voltage value to obtain a compensated voltage value; performing an addition operation on the proportional differential voltage value, the feedforward voltage value and the compensation voltage value to obtain the adjustment voltage value.

[0011] As a further solution of the present invention: the proportional differential operation is performed on the difference between the preset voltage value and the current output voltage value of the voltage conversion circuit to obtain the proportional differential voltage value, including: subtracting the preset voltage value from the current output voltage value of the voltage conversion circuit to obtain the differential voltage value; performing proportional and differential operations on the differential voltage value respectively to obtain the proportional voltage value and the differential voltage value accordingly; and adding the proportional voltage value and the differential voltage value to obtain the proportional differential voltage value.

[0012] As a further solution of the present invention: In step 3, based on a preset first calculation formula, a dynamic voltage drop is obtained according to the fundamental current value, the basic parameters of the step-up transformer and the basic parameters of the step-down transformer, and the first pulse width is calculated according to the actual voltage value and the dynamic voltage drop. The first calculation formula is:

[0013]

[0014] Among them, Vdrop is the dynamic voltage drop, F0 is the operating frequency, I0 is the fundamental current value, L1 is the inductance value of the leakage inductance of the step-up transformer, T1 is the transformation ratio of the step-up transformer, η1 is the efficiency of the step-up transformer, L2 is the inductance value of the leakage inductance of the step-down transformer, T2 is the transformation ratio of the step-down transformer, and η2 is the efficiency of the step-down transformer.

[0015] As a further scheme of the present invention: the step three is based on a preset first calculation formula, and the dynamic voltage drop is obtained according to the fundamental current value, the basic parameters of the step-up transformer and the basic parameters of the step-down transformer. The first pulse width is calculated according to the actual voltage value and the dynamic voltage drop. Specifically, the step three includes: calculating the difference between the actual voltage value and the dynamic voltage drop to obtain the feedback output value of the power supply; presetting the ideal output value of the power supply; and generating the first pulse width according to the feedback output value and the ideal output value.

[0016] As a further solution of the present invention: the step 4 is based on a preset second calculation formula, according to the dynamic voltage drop and the first pulse width, to calculate the second pulse width; generate a PWM control signal with a pulse width of the second pulse width, and use the PWM control signal to adjust the output of the power supply, the second calculation formula is:

[0017] W2=W1+K*Vdrop

[0018] Wherein, W1 is the first pulse width, W2 is the second pulse width, K is the ratio of the first pulse width to the ideal output value, and Vdrop is the dynamic voltage drop.

[0019] Output voltage regulation system based on battery charge, including:

[0020] A first determination module, used to determine an adjustment voltage value according to a preset voltage value and a current output voltage value of the voltage conversion circuit;

[0021] A second determination module is used to detect the current in the voltage conversion circuit to obtain a detection current value of the voltage conversion circuit, and determine the maximum output voltage value of the voltage conversion circuit according to the detection current value;

[0022] The acquisition module is used to collect the actual voltage value of the power supply output and the fundamental current value at the operating frequency in real time;

[0023] A dynamic voltage drop generating unit, configured to obtain a dynamic voltage drop based on a preset first calculation formula, according to a fundamental current value, basic parameters of a step-up transformer, and basic parameters of a step-down transformer;

[0024] A pulse width generating module, used for generating a first pulse width and a second pulse width;

[0025] The regulating control module is used to generate a PWM control signal with a pulse width of the second pulse width, and use the PWM control signal to regulate the output of the power supply.

[0026] As a further solution of the present invention: it also includes an initial compensation module, which is used to drive the controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle after a single-phase grounding fault occurs in the voltage conversion circuit.

[0027] As a further solution of the present invention: it also includes a compensation adjustment module, which is used to calculate the absolute value of the phase difference between the voltage angle of the neutral point and the current angle of the controllable voltage source output compensation, and use the difference between the absolute value of the phase difference and the preset reference angle as the angle characteristic deviation; judge whether the absolute value of the angle characteristic deviation is greater than the preset deviation threshold; if the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjust the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

[0028] As a further solution of the present invention: the pulse width generation module includes a first pulse width generation unit and a second pulse width generation unit; the first pulse width generation unit is used to calculate the first pulse width according to the actual voltage value and the dynamic voltage drop; the second pulse width generation unit is used to calculate the second pulse width according to the dynamic voltage drop and the first pulse width based on a preset second calculation formula.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The output voltage regulation method and regulation system based on battery power can calculate the dynamic voltage drop, that is, the loss of the power supply output voltage during the transmission process. The calculated first pulse width is the pulse width required to overcome only the power supply's own loss, and the calculated second pulse width is the pulse width required to overcome both the loss during the transmission process and the power supply's own loss. That is, after the output of the power supply is regulated by a PWM control signal with a pulse width of the second pulse width, the fluctuation of the voltage transmitted to the load end can be reduced, thereby improving the stability of the voltage transmitted to the load end; at the same time, the regulated voltage value can be determined according to the preset voltage value and the current output voltage value of the voltage conversion circuit, the regulated voltage value can be determined quickly, and the detection current value of the voltage conversion circuit can be obtained by detecting the current in the voltage conversion circuit, and then the maximum output voltage value of the voltage conversion circuit can be determined according to the detection current value. The output voltage value of the voltage conversion circuit can also be regulated to the regulated voltage value or the maximum output voltage value according to the relationship between the regulated voltage value and the maximum output voltage value, thereby quickly regulating the output voltage value of the voltage conversion circuit and performing corresponding protection on the output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flow chart of the output voltage regulation method based on battery power of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the output voltage regulation system based on battery power of the present invention.

[0033] Figure 3 It is a structural schematic diagram of a pulse width generation module in the output voltage regulation system based on battery power of the present invention. DETAILED DESCRIPTION

[0034] In one embodiment, Figure 1-Figure 3 As shown, the output voltage regulation method based on battery power includes the following steps:

[0035] Step 1: Determine the adjustment voltage value according to the preset voltage value and the current output voltage value of the voltage conversion circuit;

[0036] Step 2: Collect the actual voltage value of the power supply output and the fundamental current value at the operating frequency in real time to determine the maximum output voltage value of the voltage conversion circuit;

[0037] Step 3: Based on a preset first calculation formula, a dynamic voltage drop is obtained according to the fundamental current value, basic parameters of the step-up transformer, and basic parameters of the step-down transformer, and a first pulse width is calculated according to the actual voltage value and the dynamic voltage drop;

[0038] Step 4: Based on a preset second calculation formula, according to the dynamic voltage drop and the first pulse width, a second pulse width is calculated; a PWM control signal with a pulse width of the second pulse width is generated, and the output of the power supply is adjusted using the PWM control signal;

[0039] Step 1 determines the regulated voltage value according to the preset voltage value and the current output voltage value of the voltage conversion circuit, including: performing a proportional differential operation on the difference between the preset voltage value and the current output voltage value of the voltage conversion circuit to obtain a proportional differential voltage value; performing a feedforward operation on the preset voltage value to obtain a feedforward voltage value, and performing a compensation operation on the preset voltage value to obtain a compensation voltage value; performing an addition operation on the proportional differential voltage value, the feedforward voltage value and the compensation voltage value to obtain the regulated voltage value;

[0040] Performing a proportional differential operation on the difference between the preset voltage value and the current output voltage value of the voltage conversion circuit to obtain a proportional differential voltage value, including: performing a subtraction operation on the preset voltage value and the current output voltage value of the voltage conversion circuit to obtain a differential voltage value; performing proportional and differential operations on the differential voltage value to obtain a proportional voltage value and a differential voltage value respectively; performing an addition operation on the proportional voltage value and the differential voltage value to obtain a proportional differential voltage value;

[0041] Step 3: Based on the preset first calculation formula, the dynamic voltage drop is obtained according to the fundamental current value, the basic parameters of the step-up transformer and the basic parameters of the step-down transformer. According to the actual voltage value and the dynamic voltage drop, the first pulse width is calculated. The first calculation formula is:

[0042]

[0043] Wherein, Vdrop is the dynamic voltage drop, F0 is the operating frequency, I0 is the fundamental current value, L1 is the inductance value of the leakage inductance of the step-up transformer, T1 is the transformation ratio of the step-up transformer, η1 is the efficiency of the step-up transformer, L2 is the inductance value of the leakage inductance of the step-down transformer, T2 is the transformation ratio of the step-down transformer, and η2 is the efficiency of the step-down transformer;

[0044] Step 3: Based on a preset first calculation formula, a dynamic voltage drop is obtained according to the fundamental current value, the basic parameters of the step-up transformer and the basic parameters of the step-down transformer, and a first pulse width is calculated according to the actual voltage value and the dynamic voltage drop. Specifically, the first pulse width is calculated according to the actual voltage value and the dynamic voltage drop, which includes: calculating the difference between the actual voltage value and the dynamic voltage drop to obtain a feedback output value of the power supply; presetting an ideal output value of the power supply; generating a first pulse width according to the feedback output value and the ideal output value;

[0045] Step 4: Based on the preset second calculation formula, according to the dynamic voltage drop and the first pulse width, the second pulse width is calculated; a PWM control signal with a pulse width of the second pulse width is generated, and the output of the power supply is adjusted using the PWM control signal. The second calculation formula is:

[0046] W2=W1+K*Vdrop

[0047] Wherein, W1 is the first pulse width, W2 is the second pulse width, K is the ratio of the first pulse width to the ideal output value, and Vdrop is the dynamic voltage drop;

[0048] Among them, the first pulse width is calculated using the PID algorithm. In the related art, when using the PID algorithm to control the constant voltage output of the power supply, it is usually necessary to collect the voltage output by the power supply in real time as feedback, and adjust the voltage output by the power supply in real time through feedback to realize a closed-loop regulation system for the power supply output control. The PID algorithm is mainly used to overcome the output voltage fluctuations caused by the internal loss of the power supply and the different remaining power of the power supply. However, in this embodiment, in order to maintain the stability of the load-end voltage, the power supply is not a constant voltage output, that is, the actual voltage value collected cannot be directly used as feedback for the PID algorithm. The actual voltage value needs to be subtracted from the dynamic voltage drop to obtain the value obtained as the feedback output value of the power supply, and then according to the preset ideal output value of the power supply, the PID algorithm can be used to calculate the required first pulse width;

[0049] Output voltage regulation system based on battery charge, including:

[0050] A first determination module, used to determine an adjustment voltage value according to a preset voltage value and a current output voltage value of the voltage conversion circuit;

[0051] A second determination module is used to detect the current in the voltage conversion circuit to obtain a detection current value of the voltage conversion circuit, and determine the maximum output voltage value of the voltage conversion circuit according to the detection current value;

[0052] The acquisition module is used to collect the actual voltage value of the power supply output and the fundamental current value at the operating frequency in real time;

[0053] A dynamic voltage drop generating unit, configured to obtain a dynamic voltage drop based on a preset first calculation formula, according to a fundamental current value, basic parameters of a step-up transformer, and basic parameters of a step-down transformer;

[0054] A pulse width generating module, used for generating a first pulse width and a second pulse width;

[0055] A regulating control module, used for generating a PWM control signal with a pulse width of the second pulse width, and regulating the output of the power supply using the PWM control signal;

[0056] It also includes an initial compensation module, which is used to drive the controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle after a single-phase grounding fault occurs in the voltage conversion circuit;

[0057] It also includes a compensation adjustment module, which is used to calculate the absolute value of the phase difference between the voltage angle of the neutral point and the current angle of the controllable voltage source output compensation, and use the difference between the absolute value of the phase difference and the preset reference angle as the angle characteristic deviation; determine whether the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, if the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjust the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold;

[0058] The pulse width generation module includes a first pulse width generation unit and a second pulse width generation unit; the first pulse width generation unit is used to calculate the first pulse width according to the actual voltage value and the dynamic voltage drop; the second pulse width generation unit is used to calculate the second pulse width according to the dynamic voltage drop and the first pulse width based on a preset second calculation formula.

[0059] The present invention can calculate the dynamic voltage drop, that is, the loss of the output voltage of the power supply during the transmission process. The calculated first pulse width is the pulse width required to overcome only the loss of the power supply itself, and the calculated second pulse width is the pulse width required to overcome the loss during the transmission process and the loss of the power supply itself at the same time, that is, after the output of the power supply is adjusted by a PWM control signal with a pulse width of the second pulse width, the fluctuation of the voltage transmitted to the load end can be reduced, thereby achieving the improvement of the stability of the voltage transmitted to the load end; at the same time, the adjustment voltage value can be determined according to the preset voltage value and the current output voltage value of the voltage conversion circuit, the adjustment voltage value can be quickly determined, and the detection current value of the voltage conversion circuit can be obtained by detecting the current in the voltage conversion circuit, and then the maximum output voltage value of the voltage conversion circuit can be determined according to the detection current value, and the output voltage value of the voltage conversion circuit can be adjusted to the adjustment voltage value or the maximum output voltage value according to the relationship between the adjustment voltage value and the maximum output voltage value, so that the output voltage value of the voltage conversion circuit can be quickly adjusted, and the output voltage can be correspondingly protected.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. The output voltage regulation method based on battery power is characterized in that: The following steps are involved: Step 1: Determine the adjustment voltage value according to the preset voltage value and the current output voltage value of the voltage conversion circuit; Step 2: Collect the actual voltage value of the power supply output and the fundamental current value at the operating frequency in real time to determine the maximum output voltage value of the voltage conversion circuit; Step 3: Based on a preset first calculation formula, a dynamic voltage drop is obtained according to the fundamental current value, basic parameters of the step-up transformer, and basic parameters of the step-down transformer, and a first pulse width is calculated according to the actual voltage value and the dynamic voltage drop; Step 4: Based on a preset second calculation formula, a second pulse width is calculated according to the dynamic voltage drop and the first pulse width; A PWM control signal with a second pulse width is generated, and the output of the power supply is adjusted using the PWM control signal.

2. The method for adjusting the output voltage based on the battery power according to claim 1, characterized in that: The step 1 determines the adjustment voltage value according to the preset voltage value and the current output voltage value of the voltage conversion circuit, including: performing a proportional differential operation on the difference between the preset voltage value and the current output voltage value of the voltage conversion circuit to obtain a proportional differential voltage value; performing a feedforward operation on the preset voltage value to obtain a feedforward voltage value, and performing a compensation operation on the preset voltage value to obtain a compensated voltage value; performing an addition operation on the proportional differential voltage value, the feedforward voltage value and the compensation voltage value to obtain the adjustment voltage value.

3. The method for adjusting the output voltage based on the battery power according to claim 1, characterized in that: The method of performing a proportional differential operation on the difference between the preset voltage value and the current output voltage value of the voltage conversion circuit to obtain a proportional differential voltage value includes: performing a subtraction operation on the preset voltage value and the current output voltage value of the voltage conversion circuit to obtain a differential voltage value; performing proportional and differential operations on the differential voltage value to obtain a proportional voltage value and a differential voltage value respectively; and performing an addition calculation on the proportional voltage value and the differential voltage value to obtain a proportional differential voltage value.

4. The method for adjusting the output voltage based on the battery power according to claim 1, characterized in that: In step 3, based on a preset first calculation formula, a dynamic voltage drop is obtained according to the fundamental current value, basic parameters of the step-up transformer, and basic parameters of the step-down transformer. According to the actual voltage value and the dynamic voltage drop, the first pulse width is calculated. The first calculation formula is: Among them, Vdrop is the dynamic voltage drop, F0 is the operating frequency, I0 is the fundamental current value, L1 is the inductance value of the leakage inductance of the step-up transformer, T1 is the transformation ratio of the step-up transformer, η1 is the efficiency of the step-up transformer, L2 is the inductance value of the leakage inductance of the step-down transformer, T2 is the transformation ratio of the step-down transformer, and η2 is the efficiency of the step-down transformer.

5. The method for adjusting the output voltage based on the battery power according to claim 1, characterized in that: The step three is based on a preset first calculation formula, obtains the dynamic voltage drop according to the fundamental current value, the basic parameters of the step-up transformer and the basic parameters of the step-down transformer, and calculates the first pulse width according to the actual voltage value and the dynamic voltage drop. Specifically, the step three includes: calculating the difference between the actual voltage value and the dynamic voltage drop to obtain the feedback output value of the power supply; presetting the ideal output value of the power supply; and generating the first pulse width according to the feedback output value and the ideal output value.

6. The method for adjusting the output voltage based on the battery power according to claim 1, characterized in that: In the step 4, based on a preset second calculation formula, the second pulse width is calculated according to the dynamic voltage drop and the first pulse width; a PWM control signal with a pulse width of the second pulse width is generated, and the output of the power supply is adjusted using the PWM control signal. The second calculation formula is: W2=W1+K*Vdrop Wherein, W1 is the first pulse width, W2 is the second pulse width, K is the ratio of the first pulse width to the ideal output value, and Vdrop is the dynamic voltage drop.

7. An output voltage regulation system based on battery power, characterized in that: include: A first determination module, used to determine an adjustment voltage value according to a preset voltage value and a current output voltage value of the voltage conversion circuit; A second determination module is used to detect the current in the voltage conversion circuit to obtain a detection current value of the voltage conversion circuit, and determine the maximum output voltage value of the voltage conversion circuit according to the detection current value; The acquisition module is used to collect the actual voltage value of the power supply output and the fundamental current value at the operating frequency in real time; A dynamic voltage drop generating unit, configured to obtain a dynamic voltage drop based on a preset first calculation formula, according to a fundamental current value, basic parameters of a step-up transformer, and basic parameters of a step-down transformer; A pulse width generating module, used for generating a first pulse width and a second pulse width; The regulating control module is used to generate a PWM control signal with a pulse width of the second pulse width, and use the PWM control signal to regulate the output of the power supply.

8. The output voltage regulation system based on battery power according to claim 7, characterized in that: It also includes an initial compensation module, which is used to drive the controllable voltage source to provide output compensation to the neutral point with a preset initial voltage amplitude as the current voltage amplitude and a preset initial voltage angle as the current voltage angle after a single-phase grounding fault occurs in the voltage conversion circuit.

9. The output voltage regulation system based on battery power according to claim 7, characterized in that: It also includes a compensation adjustment module, which is used to calculate the absolute value of the phase difference between the voltage angle of the neutral point and the current angle of the controllable voltage source output compensation, and use the difference between the absolute value of the phase difference and the preset reference angle as the angle characteristic deviation; Determine whether the absolute value of the angle characteristic deviation is greater than the preset deviation threshold. If the absolute value of the angle characteristic deviation is greater than the preset deviation threshold, adjust the current voltage amplitude based on the angle characteristic deviation until the absolute value of the angle characteristic deviation is less than or equal to the preset deviation threshold.

10. The output voltage regulation system based on battery power according to claim 7, characterized in that: The pulse width generation module includes a first pulse width generation unit and a second pulse width generation unit; A first pulse width generating unit, used for calculating a first pulse width according to an actual voltage value and a dynamic voltage drop; The second pulse width generating unit is used to calculate the second pulse width based on a preset second calculation formula, according to the dynamic voltage drop and the first pulse width.

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