A method for improving PFC bus voltage response and related equipment

Abstract

The present invention relates to a method for improving the PFC bus voltage response, comprising the following steps: inputting a first input voltage and a reference voltage into a subtraction module to obtain an error voltage; inputting the error voltage into a PI regulator for adjustment to obtain a first calculation result; inputting the first input voltage and the second input voltage into a transient power estimation voltage compensator for calculation to obtain a second calculation result; inputting the first calculation result and the second calculation result into an addition module for calculation to obtain a third calculation result; inputting the third calculation result into a PWM module to obtain a pulse signal output by the PWM module, and quickly controlling a BUS circuit through the pulse signal. The speed of the PFC bus voltage response is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage response, and in particular to a method for improving PFC bus voltage response and related equipment. Background Art

[0002] For the power supply equipment on the market (simply referring to power electronic equipment for AC / DC conversion), a two-stage circuit structure is generally adopted. The front stage is an APFC (active power factor correction) circuit to reduce the harmonic emission to the input power grid, and at the same time output a stable DC BUS circuit voltage, also called bus voltage, as the input of the next stage; the next stage circuit adopts various circuits such as isolated or non-isolated BUCK or LLC to output a DC or AC voltage to meet various load requirements.

[0003] General power supplies have dynamic output performance index requirements, such as 0%-25%, 0%-50%, 0%-75%, 0%-100% load switching requires the output voltage to drop or overshoot no more than 5%. Special power supplies have higher requirements, such as laser power supplies, various combinations of switching frequency and switching load size, and the requirement is not more than 2.5%. In order to meet the dynamic output requirements, in addition to the reasonable design of the subsequent circuit itself, the stability of the input bus voltage of the subsequent stage is also very important. If the BUS voltage drops sharply when the switch of the subsequent circuit switches between opening and closing, the output voltage of the subsequent circuit will respond slowly and fail to meet the dynamic output performance index requirements of the power supply. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for improving the PFC bus voltage response and related equipment, which solves the technical problem that the output voltage of the subsequent circuit will respond slowly when the switch of the subsequent circuit is switched between opening and closing.

[0005] To achieve the above object, the present invention provides a method for improving PFC bus voltage response, comprising the following steps:

[0006] Inputting the first input voltage and the preset reference voltage into a subtraction module to obtain an error voltage; and inputting the error voltage into a PI regulator for adjustment to obtain a first calculation result;

[0007] Inputting the first input voltage and the second input voltage into a transient power estimation voltage compensator for calculation to obtain a second calculation result; wherein the time when the first input voltage is output takes precedence over the time when the second input voltage is output;

[0008] Inputting the first calculation result and the second calculation result into an adding module for calculation to obtain a third calculation result;

[0009] The third calculation result is input into the PWM module to obtain a pulse signal output by the PWM module, and the BUS circuit is quickly controlled by the pulse signal.

[0010] As a further solution of the present invention, the error voltage is input into a PI regulator for adjustment, and the first calculation result obtained includes:

[0011] Inputting the error voltage into a proportional operation model in the PI regulator, and performing proportional operation adjustment with the preset reference voltage to obtain a first proportional adjustment voltage and a second proportional adjustment voltage;

[0012] The first proportional regulation voltage and the second proportional regulation voltage are respectively integrated with the preset reference voltage through an integral operation model in the PI regulator to obtain a first calculation result.

[0013] As a further solution of the present invention, after the step of inputting the third calculation result into the PWM module to obtain the pulse signal output by the PWM module, the method further comprises:

[0014] Based on the value of the third calculation result, obtain the square wave parameters output by the switch tube in the BUS circuit in the transient power estimation voltage compensator;

[0015] Calculating the square wave parameters output by the switch tube to determine the on and / or off state of the switch tube, and obtaining the parameters corresponding to the on and / or off state of the switch tube based on the on and / or off state of the switch tube;

[0016] Based on the parameters corresponding to the on and / or off states of the switch tube, the on response time and / or off response time of the switch tube are obtained, and based on the on response time of the switch tube, the PFC bus voltage response time is obtained.

[0017] As a further solution of the present invention, the transient power estimation voltage compensator includes a BUS circuit;

[0018] Inputting the first input voltage and the second input voltage into a transient power estimation voltage compensator for calculation to obtain a second calculation result, including:

[0019] Acquire the BUS capacitor capacity, the time of the first input voltage, and the time of the second input voltage in the BUS circuit, and calculate the BUS capacitor capacity, the time of the first input voltage, the time of the second input voltage, the first input voltage, and the second input voltage by the transient power estimation voltage compensator to obtain the current of the BUS capacitor;

[0020] The current of the BUS capacitor is calculated using the following formula:

[0021] ;

[0022] obtaining an average voltage based on the second input voltage and the first input voltage, and fusing the average voltage with the current of the BUS capacitor to obtain the power of the BUS capacitor;

[0023] The power of the BUS capacitor is calculated using the following formula:

[0024] ;

[0025] Obtaining a voltage compensation value based on the power of the BUS capacitor;

[0026] The voltage compensation value is calculated using the following formula:

[0027] ;

[0028] Among them, the is the first input voltage, the is the second input voltage, The time for the first input voltage, The time for the second input voltage, is the current of the BUS capacitor, is the power of the BUS capacitor, To adjust the constant, is the voltage compensation value, and C is the capacitance of the BUS capacitor.

[0029] As a further solution of the present invention, the following formula is used to calculate the response time of the switch tube being turned on:

[0030] ;

[0031] in, is the first calculation result, is the voltage compensation value, is the clock period of the PWM module, It is the response time of the switch tube turning on.

[0032] As a further solution of the present invention, the square wave parameters output by the switch tube are calculated to determine the on and / or off state of the switch tube:

[0033] Calculating the inductor current in the BUS circuit at the zero position based on the square wave parameters output by the switch tube to obtain an inductor generated zero crossing detection signal;

[0034] When the zero-crossing detection signal detects that the inductor current is at the zero position, the reset calculator is driven to reset, and the PWM module is driven to output a high level; wherein, when the PWM module outputs a high level, it is determined that the switch tube is in the on state;

[0035] When the reset counter starts counting upward from zero, a first count value is obtained;

[0036] When the first count value is equal to a preset value, the PWM module is driven to output a low level; wherein, when the PWM module outputs a low level, it is determined that the switch tube is in a closed state.

[0037] The present invention also provides a device for improving PFC bus voltage response, comprising:

[0038] A first calculation module, used for inputting the first input voltage and the reference voltage into a subtraction module to obtain an error voltage; and inputting the error voltage into a PI regulator for adjustment to obtain a first calculation result;

[0039] A second calculation module, used for inputting the first input voltage and the second input voltage into the transient power estimation voltage compensator for calculation to obtain a second calculation result;

[0040] A third calculation module, inputting the first calculation result and the second calculation result into an addition module for calculation to obtain a third calculation result;

[0041] The control module is used to input the third calculation result into the PWM module to obtain the pulse signal output by the PWM module, and quickly control the BUS circuit through the pulse signal.

[0042] The present invention also provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any one of the above methods when executing the computer program.

[0043] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of any of the above-mentioned methods are implemented.

[0044] The method for improving the PFC bus voltage response and the related device provided by the present invention include the following steps: inputting a first input voltage and a reference voltage into a subtraction module to obtain an error voltage; inputting the error voltage into a PI regulator for adjustment to obtain a first calculation result; inputting the first input voltage and the second input voltage into a transient power estimation voltage compensator for calculation to obtain a second calculation result; inputting the first calculation result and the second calculation result into an addition module for calculation to obtain a third calculation result; inputting the third calculation result into a PWM module to obtain a pulse signal output by the PWM module, and quickly controlling the BUS circuit through the pulse signal; the technical problem that the output voltage of the subsequent circuit will respond slowly due to a sharp drop in the voltage in the BUS circuit is solved, and the response time of the PFC bus voltage is greatly shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the steps of a method for improving PFC bus voltage response in one embodiment of the present invention;

[0046] Figure 2 It is a structural block diagram of a device for improving PFC bus voltage response in one embodiment of the present invention;

[0047] Figure 3 is a module block diagram of a PFC bus circuit in one embodiment of the present invention;

[0048] Figure 4 It is a block diagram of a BUS circuit module in a transient power estimation voltage compensator in one embodiment of the present invention;

[0049] Figure 5 FIG. 1 is a schematic block diagram of the structure of a computer device according to an embodiment of the present invention.

[0050] Reference numerals: D1, first diode; D2, second diode; D3, third diode; D4, fourth diode; D5, fifth diode; C1, capacitor; L, inductor; V-ac, current source; Q1, switch tube; Vref, preset reference voltage, Vbus （n） , first input voltage; Vbus （n-1） , the second input voltage.

[0051] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] like Figure 1 and Figure 3 As shown, Figure 1 It is a schematic diagram of the steps of a method for improving PFC bus voltage response in one embodiment of the present invention; Figure 3 It is a module block diagram of a PFC bus circuit in one embodiment of the present invention.

[0054] See also Figure 3 The subtraction module has a first end and a second end, the first end of the subtraction module receives a preset reference voltage, the second end of the subtraction module receives a first input voltage, the output end of the subtraction module is connected to the input end of the PI regulator, and the output end of the PI regulator is connected to the input end of the addition module; the transient power estimation voltage compensator has a first receiving end and a second receiving end, the first receiving end of the transient power estimation voltage compensator receives the first input voltage, the second receiving end of the transient power estimation voltage compensator receives the second input voltage, the output end of the transient power estimation voltage compensator is connected to the addition module, the output end of the addition module is connected to the input end of the PWM module, and the output end of the PWM module outputs a PWM pulse signal.

[0055] A method for improving PFC bus voltage response includes the following steps:

[0056] Step S101, inputting a first input voltage and a preset reference voltage into a subtraction module to obtain an error voltage; and inputting the error voltage into a PI regulator for adjustment to obtain a first calculation result.

[0057] It can be understood that the values ​​of the first input voltage and the preset reference voltage are obtained, the preset reference voltage is subtracted from the first input voltage to obtain the error voltage, and the error voltage is input into the PI regulator; the PI regulator is usually composed of two control links, namely, proportional (P) and integral (I), and their function is to adjust the output according to the error voltage. The specific operation steps are as follows: proportional link: multiply the error voltage by the proportional coefficient (Kp) to obtain the proportional control amount. Proportional regulation is mainly used to quickly respond to the error of the system, which is proportional to the error. Therefore, the size of the proportional coefficient will affect the response speed and stability of the system. Integral link: multiply the integral of the error voltage and time by the integral coefficient (Ki) to obtain the integral control amount. Integral regulation is mainly used to eliminate the static error of the system, even if the error still exists when the system reaches a steady state. The function of the integral link is to adjust the output according to the historical sum of the error to reduce the steady-state error; by appropriately adjusting the proportional coefficient and the integral coefficient, the system can be precisely controlled. Such an operation can bring the following technical effects: (1) Precise control: By inputting the error voltage into the PI regulator for adjustment, the system output can be precisely controlled. The regulator automatically adjusts the output to reduce the error according to the size and change rate of the error signal, and keeps the system near the preset reference voltage; (2) Steady-state error elimination: The integral link in the PI regulator can eliminate the steady-state error of the system, and even the error that still exists when the system reaches a steady state can be reduced or eliminated. (3) Response speed adjustment: By adjusting the proportional coefficient and the integral coefficient, the response speed of the system can be adjusted. Increasing the proportional coefficient can increase the response speed of the system, but may cause oscillation or instability; increasing the integral coefficient can reduce the steady-state error, but may cause overshoot or oscillation. Therefore, it is necessary to make appropriate adjustments according to specific application requirements. In summary, by inputting the first input voltage and the preset reference voltage into the subtraction module and then adjusting it through the PI regulator, the system output can be accurately controlled and the steady-state error can be eliminated. At the same time, by adjusting the proportional coefficient and the integral coefficient, the response speed and stability of the system can also be adjusted.

[0058] Step S102, inputting the first input voltage and the second input voltage into a transient power estimation voltage compensator for calculation to obtain a second calculation result; wherein, the time when the first input voltage is output takes precedence over the time when the second input voltage is output.

[0059] It can be understood that the values ​​of the first input voltage and the second input voltage are obtained, and the first input voltage and the second input voltage are input into the transient power estimation voltage compensator for calculation. The transient power estimation voltage compensator is usually composed of two control links, namely, proportional (P) and integral (I), which are used to adjust the output according to the input voltage. The specific operation steps are as follows: the input voltage is multiplied by the proportional coefficient (Kp) to obtain the proportional control amount. Proportional regulation is mainly used to quickly respond to the error of the system, which is proportional to the input voltage. Therefore, the size of the proportional coefficient will affect the response speed and stability of the system. The integral of the input voltage and time is multiplied by the integral coefficient (Ki) to obtain the integral control amount. Integral regulation is mainly used to eliminate the static error of the system, even if the error still exists when the system reaches a steady state. The role of the integral link is to adjust the output according to the historical sum of the error to reduce the steady-state error; by appropriately adjusting the proportional coefficient and the integral coefficient, the system can be accurately controlled. Such an operation can bring the following technical effects: (1) By inputting the first input voltage and the second input voltage into the transient power estimation voltage compensator for calculation, the system calculation results can be accurately controlled. The regulator automatically adjusts the output according to the size and change rate of the input voltage to reduce the error and keep the calculation result near the preset reference value; (2) The integral link in the transient power estimation voltage compensator can eliminate the steady-state error of the system, and even the error that still exists when the system reaches a steady state can be reduced or eliminated; (3) By adjusting the proportional coefficient and the integral coefficient, the system response speed can be adjusted. Increasing the proportional coefficient can increase the response speed of the system, but may cause oscillation or instability; increasing the integral coefficient can reduce the steady-state error, but may cause overshoot or oscillation. Therefore, it is necessary to make appropriate adjustments according to specific application requirements; In summary, by inputting the first input voltage and the second input voltage into the transient power estimation voltage compensator for calculation, and then adjusting them through the transient power estimation voltage compensator, the system calculation results can be accurately controlled and the steady-state error can be eliminated. At the same time, by adjusting the proportional coefficient and the integral coefficient, the response speed and stability of the system can also be adjusted.

[0060] Step S103: input the first calculation result and the second calculation result into an addition module for calculation to obtain a third calculation result.

[0061] It can be understood that the values ​​of the first calculation result and the second calculation result are obtained, and the first calculation result and the second calculation result are input into the addition module; the addition module is usually a simple adder, which adds the two input values ​​and outputs their sum. The specific operation steps are as follows: add the first calculation result and the second calculation result to obtain a third calculation result. This can be achieved by adding the two values, such as using an addition circuit or an addition operator in a programming language; through such an operation, the two calculation results can be added to obtain a third calculation result. Such an operation can bring the following technical effects: (1) Adding the first calculation result and the second calculation result can obtain their sum. This is very useful for applications that require multiple calculation results to be added together, such as in statistics, data analysis or cumulative calculations; (2) By using an adder or an accurate addition operator in a programming language, the accurate addition of the first calculation result and the second calculation result can be ensured, avoiding inaccuracies caused by calculation errors. (3) Since addition is a basic arithmetic operation, the addition module can usually perform calculations at a very high speed. This enables the third calculation result to be obtained in a shorter time, improving the calculation efficiency; in short, by inputting the first calculation result and the second calculation result into the addition module for calculation, the accumulation, accurate calculation and fast calculation of values ​​can be achieved. Such operations can play a role in various applications, including cumulative calculation, statistical analysis and data processing.

[0062] Step S104: input the third calculation result into the PWM module to obtain a pulse signal output by the PWM module, and quickly control the BUS circuit through the pulse signal.

[0063] Specifically, the value of the third calculation result is obtained, and the third calculation result is input into the PWM module; the PWM module is usually composed of a counter and a comparator. The counter is used to generate an increasing count value, and the comparator is used to compare the value of the counter with the third calculation result and generate a corresponding pulse signal. The specific operation steps are as follows: configure the PWM module: according to the system requirements, set the parameters such as the working frequency and accuracy of the PWM module, and use the third calculation result as the reference value of the comparator: set the third calculation result as the comparison value of the comparator, which is used to compare with the count value of the counter, and the counter in the PWM module starts to count up and generate a periodic count value. The comparator compares the count value of the counter with the third calculation result. When the count value of the counter is less than the third calculation result, the comparator outputs a high level; when the count value of the counter is greater than or equal to the third calculation result, the comparator outputs a low level. The pulse signal generated in this way has an adjustable duty cycle (the ratio of the high level time to the period) and is used to quickly control the BUS circuit.

[0064] Through the above operation, the third calculation result can be converted into a pulse signal output by the PWM module, thereby quickly controlling the BUS circuit. Such operation can bring the following technical effects: (1) The PWM module can quickly generate a pulse signal, and by adjusting the duty cycle of the pulse signal, it can achieve rapid control of the BUS circuit. This is very useful for applications that require high-speed response, such as motor control, power supply regulation, etc. (2) By adjusting the third calculation result and the parameters of the PWM module, the pulse signal can be accurately controlled. This enables precise control of specific parameters of the BUS circuit, such as voltage, power, etc. (3) PWM technology can achieve energy regulation by adjusting the duty cycle of the pulse signal. By controlling the high-level time and cycle of the pulse signal, energy saving can be achieved and energy consumption can be reduced. In short, the third calculation result is input into the PWM module, and the BUS circuit is quickly controlled by generating a pulse signal, which can achieve technical effects such as rapid response, precise control and energy-saving regulation. Such operation has a wide range of applications in many fields, including power electronics, automation control and embedded systems.

[0065] In some embodiments, the error voltage is input into a PI regulator for regulation, and obtaining a first calculation result includes:

[0066] Inputting the error voltage into a proportional operation model in the PI regulator, and performing proportional operation adjustment with the preset reference voltage to obtain a first proportional adjustment voltage and a second proportional adjustment voltage;

[0067] The first proportional regulation voltage and the second proportional regulation voltage are respectively integrated with the preset reference voltage through an integral operation model in the PI regulator to obtain a first calculation result.

[0068] It can be understood that the error voltage (usually the difference between the expected value and the actual value) is input into the PI regulator, and in the proportional operation model in the PI regulator, the error voltage is proportionally adjusted with the preset reference voltage. Proportional operation is to multiply the error voltage by a proportional coefficient Kp to obtain a first proportional adjustment voltage. Proportional regulation can be used for error correction of a fast response system. Through the integral operation model in the PI regulator, the first proportional adjustment voltage is integrally calculated with the preset reference voltage. The integral operation is to multiply the integral (accumulated error) of the error voltage by an integral coefficient Ki to obtain a second proportional adjustment voltage. Integral regulation can be used to correct the steady-state error of the system, which can eliminate the static error of the system. The first proportional adjustment voltage and the second proportional adjustment voltage are added to obtain a first calculation result.

[0069] The above operation can bring the following technical effects: (1) The combination of proportional regulation and integral regulation can achieve precise control of the system. Proportional regulation is used for fast response, while integral regulation is used to eliminate static errors and make the system reach a stable state; (2) The PI regulator has good robustness and can adapt to changes in system parameters and external interference to maintain good control performance. (3) Proportional regulation provides a fast response speed, while integral regulation ensures the accuracy of the system in a steady state while avoiding overshoot and oscillation. In short, the error voltage is input into the PI regulator for regulation, and the first calculation result is obtained through proportional and integral operations, which can achieve technical effects such as precise control, enhanced robustness, fast response and steady-state accuracy. Such operations have a wide range of applications in automatic control systems, including power electronics, mechanical control, temperature control and other fields.

[0070] In some embodiments, the step of inputting the third calculation result into the PWM module to obtain the pulse signal output by the PWM module includes the following steps:

[0071] Based on the value of the third calculation result, obtain the square wave parameters output by the switch tube in the BUS circuit in the transient power estimation voltage compensator;

[0072] Calculating the square wave parameters output by the switch tube to determine the on and / or off state of the switch tube, and obtaining the parameters corresponding to the on and / or off state of the switch tube based on the on and / or off state of the switch tube;

[0073] Based on the parameters corresponding to the on and / or off states of the switch tube, the on response time and / or off response time of the switch tube are obtained, and based on the on response time of the switch tube, the PFC bus voltage response time is obtained.

[0074] It can be understood that the square wave parameters output by the switch tube in the BUS circuit in the transient power estimation voltage compensator are obtained: according to the numerical value of the third calculation result, the square wave parameters of the switch tube in the BUS circuit in the transient power estimation voltage compensator are determined, including the frequency and duty cycle. These parameters determine the characteristics of the pulse signal to achieve voltage compensation for the circuit, and the square wave parameters output by the switch tube are calculated: according to the square wave parameters of the switch tube, the on and / or off state of the switch tube in each cycle is calculated. This can be determined by comparing the current time with the on and off time points of the switch tube, and determining the parameters corresponding to the on and / or off state of the switch tube: according to the on and / or off state of the switch tube, the corresponding parameters are determined. These parameters may include the current, voltage, power, etc. of the switch tube, and the response time of the switch tube opening and / or closing is obtained: according to the opening and / or closing state of the switch tube, the time required for the switch tube to switch from the beginning to fully opening or closing is measured, that is, the response time of the switch tube, and the time of the PFC bus voltage response is obtained: based on the response time of the switch tube opening, the time required for the PFC (power factor correction) bus voltage to reach a stable state from the change is calculated. This can be used to evaluate the response performance and steady-state accuracy of the circuit.

[0075] The above operation steps can bring the following effects: (1) The pulse signal output by the PWM module can be used to control the switch tube in the BUS circuit to achieve voltage compensation of the circuit and ensure stable voltage output; (2) According to the response time of the switch tube and the response time of the PFC bus voltage, the response speed and steady-state accuracy of the system can be optimized to improve the dynamic performance of the circuit; (3) By accurately calculating the state and parameters of the switch tube, the control accuracy can be improved, the stable operation of the circuit can be ensured, and the output fluctuation can be reduced. (4) Through PWM modulation technology, the conduction and cutoff of the switch tube can be effectively controlled to reduce energy loss and improve the energy efficiency of the system.

[0076] In short, inputting the third calculation result into the PWM module and performing relevant parameter calculation and control can realize the voltage compensation of the circuit and optimize the response time, thereby improving the control accuracy and energy efficiency. Such operation has important applications in the fields of power management, power factor correction, etc.

[0077] In some embodiments, the transient power estimation voltage compensator includes a BUS circuit;

[0078] Inputting the first input voltage and the second input voltage into a transient power estimation voltage compensator for calculation to obtain a second calculation result, including:

[0079] Acquire the BUS capacitor capacity, the time of the first input voltage, and the time of the second input voltage in the BUS circuit, and calculate the BUS capacitor capacity, the time of the first input voltage, the time of the second input voltage, the first input voltage, and the second input voltage by the transient power estimation voltage compensator to obtain the current of the BUS capacitor;

[0080] The current of the BUS capacitor is calculated using the following formula:

[0081] ;

[0082] obtaining an average voltage based on the second input voltage and the first input voltage, and fusing the average voltage with the current of the BUS capacitor to obtain the power of the BUS capacitor;

[0083] The power of the BUS capacitor is calculated using the following formula:

[0084] ;

[0085] Obtaining a voltage compensation value based on the power of the BUS capacitor;

[0086] The voltage compensation value is calculated using the following formula:

[0087] ;

[0088] Among them, the is the first input voltage, the is the second input voltage, The time for the first input voltage, The time for the second input voltage, is the current of the BUS capacitor, is the power of the BUS capacitor, To adjust the constant, is the voltage compensation value, and C is the capacitance of the BUS capacitor.

[0089] It can be understood that the capacitance of the BUS capacitor, the time of the first input voltage and the time of the second input voltage are obtained: the capacitance of the BUS capacitor is obtained from the BUS circuit, and the time of the first input voltage and the second input voltage is recorded, and the capacitance of the BUS capacitor, the time of the first input voltage and the time of the second input voltage, the first input voltage and the second input voltage are integrated and calculated by the transient power estimation voltage compensator to obtain the current of the BUS capacitor: the capacitance of the BUS capacitor, the time of the first input voltage and the second input voltage, and the first input voltage and the second input voltage are calculated by the transient power estimation voltage compensator to obtain the current of the BUS capacitor, and the average value voltage is used to integrate the average value voltage with the current of the BUS capacitor to obtain the power of the BUS capacitor, and the voltage compensation value is calculated based on the power of the BUS capacitor using a given formula. The above steps can bring the following technical effects: by calculating and integrating the first input voltage and the second input voltage, the average value voltage is obtained and integrated with the current of the BUS capacitor, the influence of voltage fluctuation on the BUS capacitor can be reduced, thereby improving the stability of the voltage; according to the calculated power of the BUS capacitor, the voltage compensation value is obtained by adjusting the constant and the calculation formula. This compensation value can be used to control other devices or systems to adjust and compensate the voltage to keep it within the desired range; the application of transient power estimation voltage compensator can reduce voltage fluctuations and ripples in the power grid and improve the quality and stability of the power grid. This is very important for devices and systems that require stable voltage supply, such as industrial production lines, medical equipment, etc.; in summary, this solution can realize real-time monitoring, calculation and compensation of voltage, thereby improving voltage stability and reliability, reducing the impact of voltage fluctuations on equipment operation and system performance, and improving power grid quality and power supply reliability.

[0090] In some embodiments, the following formula is used to calculate the response time of the switch tube being turned on:

[0091] ;

[0092] in, is the first calculation result, is the voltage compensation value, is the clock period of the PWM module, It is the response time of the switch tube turning on.

[0093] It can be understood that the first input voltage, the second input voltage, and the third input voltage are obtained: the values ​​of the first input voltage, the second input voltage, and the third input voltage are obtained from the circuit, and the voltage error is calculated: the difference between the preset reference voltage and the actual input voltage is taken as the voltage error, and recorded, and the calculation method in the formula is used to calculate the value of the control signal according to the voltage error and the voltage compensation value, and the clock cycle of the PWM module and the value of the control signal are used to calculate the opening time of the switch tube, which is converted into a PWM signal output, and the response time of the switch tube is calculated according to the characteristics of the switch tube and the output of the PWM signal. In summary, this scheme can realize the compensation of voltage fluctuations, and through the adjustment of the control signal and the PWM signal, quickly respond to the voltage fluctuations in the circuit, thereby maintaining the stability of the voltage. The specific implementation process also needs to be adjusted and optimized according to the characteristics and parameters of the actual circuit.

[0094] In some embodiments, the square wave parameters output by the switch tube are calculated to determine the on and / or off state of the switch tube:

[0095] Calculating the inductor current in the BUS circuit at the zero position based on the square wave parameters output by the switch tube to obtain an inductor generated zero crossing detection signal;

[0096] When the zero-crossing detection signal detects that the inductor current is at the zero position, the reset calculator is driven to reset, and the PWM module is driven to output a high level; wherein, when the PWM module outputs a high level, it is determined that the switch tube is in the on state;

[0097] When the reset counter starts counting upward from zero, a first count value is obtained;

[0098] When the first count value is equal to a preset value, the PWM module is driven to output a low level; wherein, when the PWM module outputs a low level, it is determined that the switch tube is in a closed state.

[0099] It can be understood that the square wave parameters output by the switch tube are obtained, including the square wave frequency, duty cycle, etc., the inductance is calculated based on the square wave parameters to generate a zero-crossing detection signal, and the inductor current is detected at the zero position. When the inductor current is detected at the zero position, the reset counter is driven to reset, and the PWM module is set to output a high level to determine that the switch tube is in the on state. The reset counter starts counting upward from zero to obtain a first count value. When the first count value is equal to the preset value, the PWM module is driven to output a low level to determine that the switch tube is in the off state. Such an operation can achieve accurate control of the on and off states of the switch tube, while avoiding misjudgment or missed judgment caused by factors such as frequency deviation and circuit interference. At the same time, this method can also avoid problems such as transition oscillation and reverse current, and improve the stability and reliability of the circuit. It should be noted that the specific parameter calculation and control method may vary due to different circuit designs and application scenarios. When applied specifically, it should be optimized and adjusted in combination with actual conditions to achieve the best technical effect.

[0100] The above describes the method for improving the PFC bus voltage response in the embodiment of the present invention. The following describes the circuit for improving the PFC bus voltage response in the embodiment of the present invention. Figure 2 , an embodiment of a device for improving PFC bus voltage response in an embodiment of the present invention includes:

[0101] A first calculation module 21 is used to input the first input voltage and the reference voltage into a subtraction module to obtain an error voltage; and input the error voltage into a PI regulator for adjustment to obtain a first calculation result;

[0102] A second calculation module 22, used for inputting the first input voltage and the second input voltage into the transient power estimation voltage compensator for calculation to obtain a second calculation result;

[0103] A third calculation module 23, inputting the first calculation result and the second calculation result into an addition module for calculation to obtain a third calculation result;

[0104] The control module 24 is used to input the third calculation result into the PWM module to obtain a pulse signal output by the PWM module, and quickly control the BUS circuit through the pulse signal.

[0105] In this embodiment, for the specific implementation of each module in the above-mentioned PFC bus voltage response circuit embodiment, please refer to the above-mentioned method embodiment, which will not be described in detail here.

[0106] Reference Figure 4The present invention is a schematic diagram of the structure of a BUS circuit in a transient power estimation voltage compensator, wherein the BUS circuit includes a voltage source V-ac, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a capacitor C1, an inductor L, and a switch tube Q1; one end of the voltage source V-ac is connected between the cathode of the second diode D2 and the cathode of the fifth diode D5, the other end of the voltage source V-ac is connected between the cathode of the fourth diode D4 and the anode of the first diode D1, the anode of the first diode D1 is connected to the fourth diode D4, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the cathode of the first diode D1 is connected to the cathode of the second diode D2. The anode of the second diode D2 is connected to the cathode of the fifth diode D5, the anode of the fourth diode D4 is connected to the anode of the fifth diode D5, one end of the inductor is connected to the cathode of the second diode D2, one end of the inductor is connected to the gate of the switch tube Q1, the source of the switch tube Q1 is grounded, the drain of the switch tube Q1 receives the PWM pulse signal, the anode of the third diode D3 is connected to the other end of the inductor L, the cathode of the third diode D3 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded. It should be noted that the gate of the switch tube Q1 receives the pulse signal output by the PWM module.

[0107] Reference Figure 5 The present invention also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any one of the above methods when executing the computer program.

[0108] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the above method is implemented. It can be understood that the computer-readable storage medium in this embodiment can be a volatile readable storage medium or a non-volatile readable storage medium.

[0109] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media provided by the present invention and used in the embodiments may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double-speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM.

[0110] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0111] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for improving PFC bus voltage response, characterized in that: The following steps are involved: Inputting the first input voltage and the preset reference voltage into a subtraction module to obtain an error voltage; and inputting the error voltage into a PI regulator for adjustment to obtain a first calculation result; Inputting the first input voltage and the second input voltage into a transient power estimation voltage compensator for calculation to obtain a second calculation result; wherein the time when the first input voltage is output takes precedence over the time when the second input voltage is output; Inputting the first calculation result and the second calculation result into an adding module for calculation to obtain a third calculation result; Inputting the third calculation result into the PWM module to obtain a pulse signal output by the PWM module, and quickly controlling the BUS circuit through the pulse signal; The transient power estimation voltage compensator includes a BUS circuit; the first input voltage and the second input voltage are input into the transient power estimation voltage compensator for calculation to obtain a second calculation result, including: Acquire the BUS capacitor capacity, the time of the first input voltage, and the time of the second input voltage in the BUS circuit, and calculate the BUS capacitor capacity, the time of the first input voltage, the time of the second input voltage, the first input voltage, and the second input voltage by the transient power estimation voltage compensator to obtain the current of the BUS capacitor; The current of the BUS capacitor is calculated using the following formula: ； obtaining an average voltage based on the second input voltage and the first input voltage, and fusing the average voltage with the current of the BUS capacitor to obtain the power of the BUS capacitor; The power of the BUS capacitor is calculated using the following formula: ； Obtaining a voltage compensation value based on the power of the BUS capacitor; The voltage compensation value is calculated using the following formula: ； Among them, the is the first input voltage, the is the second input voltage, The time for the first input voltage, The time for the second input voltage, is the current of the BUS capacitor, is the power of the BUS capacitor, To adjust the constant, is the voltage compensation value, and C is the capacitance of the BUS capacitor.

2. The method for improving PFC bus voltage response according to claim 1, characterized in that: The error voltage is input into a PI regulator for adjustment, and a first calculation result is obtained, comprising: Inputting the error voltage into a proportional operation model in the PI regulator, and performing proportional operation adjustment with the preset reference voltage to obtain a first proportional adjustment voltage and a second proportional adjustment voltage; The first proportional regulation voltage and the second proportional regulation voltage are respectively integrated with the preset reference voltage through an integral operation model in the PI regulator to obtain a first calculation result.

3. The method for improving PFC bus voltage response according to claim 1, characterized in that: After the step of inputting the third calculation result into the PWM module to obtain the pulse signal output by the PWM module, the method further comprises: Based on the value of the third calculation result, obtain the square wave parameters output by the switch tube in the BUS circuit in the transient power estimation voltage compensator; Calculating the square wave parameters output by the switch tube to determine the on state of the switch tube, and obtaining the parameters corresponding to the on state of the switch tube based on the on state of the switch tube; Based on the parameters corresponding to the on-state of the switch tube, a response time of the switch tube being turned on is obtained, and based on the response time of the switch tube being turned on, a response time of the PFC bus voltage is obtained.

4. The method for improving PFC bus voltage response according to claim 3, characterized in that: The following formula is used to calculate the response time of the switch tube being turned on: ； in, is the first calculation result, is the voltage compensation value, is the clock period of the PWM module, It is the response time of the switch tube turning on.

5. The method for improving PFC bus voltage response according to claim 3, characterized in that: Calculate the square wave parameters output by the switch tube to determine the on and / or off state of the switch tube: Calculating the inductor current in the BUS circuit at the zero position based on the square wave parameters output by the switch tube to obtain an inductor generated zero crossing detection signal; When the zero-crossing detection signal detects that the inductor current is at the zero position, the reset calculator is driven to reset, and the PWM module is driven to output a high level; wherein, when the PWM module outputs a high level, it is determined that the switch tube is in the on state; When the reset counter starts counting upward from zero, a first count value is obtained; When the first count value is equal to a preset value, the PWM module is driven to output a low level; wherein, when the PWM module outputs a low level, it is determined that the switch tube is in a closed state.

6. A device for improving PFC bus voltage response, characterized in that: include: A first calculation module, used for inputting the first input voltage and the reference voltage into the subtraction module to obtain an error voltage; and inputting the error voltage into a PI regulator for adjustment to obtain a first calculation result; A second calculation module, used for inputting the first input voltage and the second input voltage into the transient power estimation voltage compensator for calculation to obtain a second calculation result; A third calculation module, inputting the first calculation result and the second calculation result into an addition module for calculation to obtain a third calculation result; A control module, used for inputting the third calculation result into the PWM module to obtain a pulse signal output by the PWM module, and quickly controlling the BUS circuit through the pulse signal; The transient power estimation voltage compensator includes a BUS circuit; Inputting the first input voltage and the second input voltage into a transient power estimation voltage compensator for calculation to obtain a second calculation result, including: Acquire the BUS capacitor capacity, the time of the first input voltage, and the time of the second input voltage in the BUS circuit, and calculate the BUS capacitor capacity, the time of the first input voltage, the time of the second input voltage, the first input voltage, and the second input voltage by the transient power estimation voltage compensator to obtain the current of the BUS capacitor; The current of the BUS capacitor is calculated using the following formula: ； obtaining an average voltage based on the second input voltage and the first input voltage, and fusing the average voltage with the current of the BUS capacitor to obtain the power of the BUS capacitor; The power of the BUS capacitor is calculated using the following formula: ； Obtaining a voltage compensation value based on the power of the BUS capacitor; The voltage compensation value is calculated using the following formula: ； Among them, the is the first input voltage, the is the second input voltage, The time for the first input voltage, The time for the second input voltage, is the current of the BUS capacitor, is the power of the BUS capacitor, To adjust the constant, is the voltage compensation value, and C is the capacitance of the BUS capacitor.

7. A computer device comprising a memory and a processor, wherein a computer program is stored in the memory, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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