A control method, device and system for a hybrid on-mode boost PFC converter

Abstract

The application discloses a control method, device and system of a hybrid conduction mode Boost PFC converter, wherein the method is used for processing or calculating initial current signals and initial voltage signals output by the Boost PFC converter in any switching period by using a hybrid conduction mode conversion control system, and then realizing the turn-on or turn-off of the Boost PFC converter. In different switching modes of the turn-on or turn-off of the Boost PFC converter, a switching switch is not needed to be set to control the switching of the Boost PFC converter in different modes, a mode recognition algorithm such as zero current detection / forward feed control is not needed to be used to recognize CCM and DCM modes, and different current correction or modulation coefficient calculation values are not needed to be added to the current in different modes, so that the turn-on or turn-off control process of the Boost PFC converter is relatively simple.

Description

Technical Field

[0001] This invention relates to the field of power electronic converter control technology, specifically to a hybrid conduction mode BoostPFC converter control method, device, and control system. Background Technology

[0002] With increasing demands for power quality, harmonic pollution has garnered growing attention. Power Factor Correction (PFC) technology effectively reduces grid-side current harmonics and improves the power factor, making it an indispensable component of power grid equipment. Boost converters are widely used in PFC circuits due to their simple topology, high conversion efficiency, and ease of control implementation. Depending on the load, they may operate in three modes: under heavy loads (medium to high power), Boost PFC converters operate in Continuous Conduction Mode (CCM); under light loads, they operate in Discontinuous Conduction Mode (DCM); and under medium to light loads, the simultaneous occurrence of CCM and DCM within a single power frequency cycle is called Mixed Conduction Mode (MCM).

[0003] Currently, to achieve high-performance converters, controllers for different loads need to be designed separately. However, when the load range varies widely, a controller that provides good performance in only one operating mode, but not in other modes, will not meet the requirements. This is especially true when the converter needs to operate in multiple operating modes, such as in uninterruptible power supplies (UPS) providing power to variable loads, electric vehicle chargers, or cloud computing power applications.

[0004] To meet the demands of wide load variations and ensure high-quality input current waveforms in both CCM and DCM modes of the Boost PFC converter, achieving low harmonics and high power factor grid connection, several MCM control methods have been proposed in recent years. The first method employs different control methods for CCM and DCM modes, switching between them using a single switch. This can achieve high-quality current waveforms across a wide load range, but its operation is relatively complex. The second method generates a compensation signal only for DCM modes to achieve MCM control. However, this method requires first using pattern recognition algorithms such as zero-current sensing / feedforward control to determine the CCM and DCM modes. Another approach involves applying different current corrections or modulation coefficients to the current in different modes to obtain accurate average inductor current values ​​in each cycle, but this method is computationally complex. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the complexity of the operation and calculation process of the control method in the prior art, thereby providing a hybrid conduction mode Boost PFC converter control method, device and control system.

[0006] In conjunction with the first aspect, embodiments of the present invention provide a hybrid conduction mode Boost PFC converter control method for a hybrid conduction mode conversion circuit. The hybrid conduction mode conversion circuit forms a closed loop by sequentially connecting an input circuit, an equivalent inductor, a rectifier diode, and an output resistor. An equivalent capacitor is connected in parallel across the output resistor. The first terminal of the Boost PFC converter is connected to the equivalent inductor, and the second terminal of the Boost PFC converter is connected to the equivalent capacitor. The method includes the following steps:

[0007] During any switching cycle of the hybrid conduction mode conversion circuit, the initial current signal flowing through the equivalent inductor and the initial voltage signal output by the hybrid conduction mode conversion circuit are acquired.

[0008] The voltage error signal of the initial voltage signal is obtained by processing the initial voltage signal through the voltage controller of the control system;

[0009] The average current signal is obtained by integrating the initial current signal through the first reset integrator of the control system.

[0010] Based on the voltage error signal and the average current signal, the input reference signal based on any given switching cycle is calculated by the first subtractor and the first multiplier of the control system.

[0011] The initial current signal is integrated by the second reset integrator of the control system to obtain the integrated current signal, and then the product of the voltage error signal and the integrated current signal is calculated by the second multiplier.

[0012] The comparator of the control system obtains the comparison result of the input reference signal and the product value, and the RS trigger of the control system triggers the Boost PFC converter to turn on or off in any switching cycle.

[0013] In conjunction with the first aspect, in one embodiment of the first aspect, based on the voltage error signal and the average current signal, the input reference signal based on any given switching cycle is calculated by the first subtractor and the first multiplier of the control system, and performed by the following formula:

[0014]

[0015] Among them, u m This is the voltage error reference signal. u o For the initial voltage signal, R e The equivalent resistance of the hybrid conduction mode conversion circuit is given. Let T be the average current signal. s The time of any given switching cycle.

[0016] In conjunction with the first aspect, in another embodiment of the first aspect, the product of the voltage error signal and the integrated current signal is calculated by the second multiplier using the following formula:

[0017]

[0018] Among them, u m The voltage error signal, u o For the initial voltage signal, R e i is the equivalent resistance of the hybrid conduction mode conversion circuit. L Let T be the initial current signal. s Let t be the time of any given switching cycle, k-1 be the previous cycle of any given switching cycle, and t be the time of any given switching cycle. on (n) represents the on-time of the Boost PFC converter during any switching cycle.

[0019] In conjunction with the first aspect, in another embodiment of the first aspect, the comparison result of the input reference signal and the product value is obtained by a comparator of the control system, and the Boost PFC converter is triggered to turn on or off in any switching cycle by an RS trigger of the control system, including:

[0020] If the product of the input reference signal and the voltage error signal is greater than or equal to the voltage error signal, the RS flip-flop switches from the first level to the second level, thereby triggering the Boost PFC converter to disconnect.

[0021] If the product of the input reference signal and the voltage error signal is less than the voltage error signal, the RS flip-flop switches from the second level to the first level, thereby triggering the Boost PFC converter to turn on.

[0022] In conjunction with the first aspect, in another embodiment of the first aspect, if the product of the input reference signal and the voltage error signal is greater than or equal to the voltage error signal, the switch from the first level to the second level via the RS flip-flop is executed by the following formula:

[0023]

[0024] Among them, u m The voltage error signal, u o For the initial voltage signal, R e i is the equivalent resistance of the hybrid conduction mode conversion circuit. L Let T be the initial current signal. s Let t be the time of any given switching cycle, k-1 be the previous cycle of any given switching cycle, and t be the time of any given switching cycle. on (n) represents the on-time of the Boost PFC converter during any switching cycle.

[0025] In conjunction with the first aspect, in another embodiment of the first aspect, if the product of the input reference signal and the voltage error signal is less than the voltage error signal, the following formula is executed:

[0026]

[0027] Among them, u m The voltage error signal, u o For the initial voltage signal, R e i is the equivalent resistance of the hybrid conduction mode conversion circuit. L Let T be the initial current signal. s Let t be the time of any given switching cycle, k-1 be the previous cycle of any given switching cycle, and t be the time of any given switching cycle. on (n) represents the on-time of the Boost PFC converter during any switching cycle.

[0028] According to a second aspect, embodiments of the present invention also provide a hybrid conduction mode Boost PFC converter control device for a hybrid conduction mode conversion circuit. The hybrid conduction mode conversion circuit forms a closed loop by sequentially connecting an input circuit, an equivalent inductor, a rectifier diode, and an output resistor. An equivalent capacitor is connected in parallel across the output resistor. The first terminal of the Boost PFC converter is connected to the equivalent inductor, and the second terminal of the Boost PFC converter is connected to the equivalent capacitor. The device includes the following modules:

[0029] The initial signal acquisition module is used to acquire the initial current signal flowing through the equivalent inductor and the initial voltage signal output by the hybrid conduction mode conversion circuit during any switching cycle of the hybrid conduction mode conversion circuit.

[0030] An error signal acquisition module is used to process the initial voltage signal through the voltage controller of the control system to obtain the voltage error signal of the initial voltage signal;

[0031] The average current calculation module is used to perform integration calculation on the initial current signal through the first reset integrator of the control system to obtain the average current signal.

[0032] The reference signal calculation module is used to calculate the input reference signal based on any switching cycle by means of the first subtractor and the first multiplier of the control system, based on the voltage error signal and the average current signal.

[0033] The product value calculation module is used to perform integration operation on the initial current signal through the second reset integrator of the control system to obtain the integrated current signal, and then calculate the product value of the voltage error signal and the integrated current signal through the second multiplier.

[0034] The control module is used to obtain the comparison result of the input reference signal and the product value based on the comparator of the control system, and to trigger the Boost PFC converter to turn on or off in any switching cycle through the RS trigger of the control system.

[0035] According to a third aspect, embodiments of the present invention also provide a hybrid conduction mode conversion control system, including a first reset integrator, a second reset integrator, a first multiplier, a second multiplier, a voltage controller, a first subtractor, a second subtractor comparator, and an RS flip-flop; wherein, the first reset integrator is used to integrate the initial voltage signal output by the hybrid conduction mode conversion circuit to obtain an average current signal; the first subtractor is used to subtract the initial voltage signal; the voltage controller is used to process the initial voltage signal after subtraction by the first subtractor, and transmit the processed initial voltage signal to the second subtractor for subtraction, and then multiply it through the first multiplier to obtain an input reference signal; the second reset integrator is used to integrate the initial current signal to obtain an integrated current signal; the second multiplier is used to calculate the product of the voltage error signal and the integrated current signal; the comparator is used to compare the input reference signal and the product value; and the RS flip-flop triggers the Boost PFC converter to turn on or off based on the comparison result of the comparator.

[0036] According to a fourth aspect, embodiments of the present invention also provide a computer-readable storage medium storing computer instructions for causing the computer to perform the hybrid conduction mode Boost PFC converter control method described in the first aspect or any embodiment of the first aspect.

[0037] According to a fifth aspect, embodiments of the present invention also provide a computer device, including: a memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to perform the hybrid conduction mode Boost PFC converter control method described in the first aspect or any embodiment of the first aspect.

[0038] The technical solution of this invention has the following advantages:

[0039] This invention discloses a hybrid conduction mode Boost PFC converter control method, device, and control system. The method utilizes a hybrid conduction mode switching control system to process or calculate the initial current and initial voltage signals output by the Boost PFC converter during any switching cycle, thereby enabling the Boost PFC converter to be turned on or off. Under different switching modes of the Boost PFC converter's on / off operation, there is no need to set up a switching switch to control the switching between different modes, nor is it necessary to use pattern recognition algorithms such as zero-current detection / feedforward control to identify CCM and DCM modes, nor is it necessary to add different current corrections or modulation coefficient calculation values ​​to the current in different modes. Therefore, the Boost PFC converter's on / off control process is relatively simple according to this invention. Attached Figure Description

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a circuit diagram of the hybrid conduction mode conversion circuit in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the hybrid conduction mode conversion control system in an embodiment of the present invention;

[0043] Figure 3 This is a flowchart of the hybrid conduction mode conversion control method in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the simulation results of the Boost PFC converter based on the hybrid conduction mode Boost PFC converter control method in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the simulation results of the MCM Boost PFC converter based on traditional average current control in an embodiment of the present invention;

[0046] Figure 6 This is another simulation result diagram of the Boost PFC converter based on the hybrid conduction mode Boost PFC converter control method proposed in this embodiment of the invention;

[0047] Figure 7This is a schematic diagram of the simulation results of the MCM Boost PFC converter based on traditional average current control in an embodiment of the present invention;

[0048] Figure 8 This is a structural block diagram of the hybrid conduction mode Boost PFC converter control device in an embodiment of the present invention;

[0049] Figure 9 This is a hardware schematic diagram of a computer device in an embodiment of the present invention.

[0050] Figure label:

[0051] 21-First reset integrator; 22-First subtractor; 23-Voltage controller;

[0052] 24 - Second subtractor; 25 - First multiplier; 26 - Second reset integrator;

[0053] 27 - Second multiplier; 28 - Comparator; 29 - RS flip-flop. Detailed Implementation

[0054] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] This invention provides a hybrid conduction mode Boost PFC converter control method, used for such... Figure 1 In the hybrid conduction mode converter circuit shown, the hybrid conduction mode converter circuit forms a closed loop by sequentially connecting the input circuit, equivalent inductor L, rectifier diode D1, and output resistor R. An equivalent capacitor C is connected in parallel across the output resistor R. The first terminal of the Boost PFC converter S is connected to the equivalent inductor L, and the second terminal of the Boost PFC converter S is connected to the equivalent capacitor C. Figure 1 In the input circuit, the input circuit includes the input power supply u in Input inductance L f Input capacitor C f The rectifier bridge is formed by connecting rectifier diodes D2-D5 in sequence, and the input power supply is u. in By input inductor L f Connect the rectifier bridge. Figure 1 middle It is the initial current signal flowing through the equivalent inductance L, i o It is the output current signal flowing through the output resistor R; i c It is the current signal flowing through the equivalent capacitance C; u o It is the initial voltage signal output by the hybrid conduction mode conversion circuit, u g It is the voltage signal output by the rectifier bridge.

[0059] like Figure 2 As shown, the hybrid conduction mode conversion control system in this embodiment of the invention includes a first reset integrator 21, a second reset integrator 26, a first multiplier 25, a second multiplier 27, a voltage controller 23, a first subtractor 22, a second subtractor 24, a comparator 28, and an RS flip-flop 29. Specifically, the first reset integrator 21 integrates the initial voltage signal output by the hybrid conduction mode conversion circuit to obtain an average current signal; the first subtractor 22 subtracts the initial voltage signal; the voltage controller 23 processes the initial voltage signal after subtraction by the first subtractor 22 and transmits the processed initial voltage signal to the second subtractor 24 for subtraction, then multiplies it by the first multiplier 25 to obtain an input reference signal; the second reset integrator integrates the initial current signal to obtain an integrated current signal; the second multiplier 27 calculates the product of the voltage error signal and the integrated current signal; the comparator 28 compares the input reference signal with the product value; and the RS flip-flop 29 triggers a Boost converter based on the comparison result of the comparator. The PFC converter is turned on or off. Figure 2The hybrid conduction mode conversion control system in the middle and Figure 1 The hybrid conduction mode conversion circuit is connected in the middle. Figure 2 In the above, comparator 28 is used to provide the comparison result to the reset terminal R of the RS flip-flop. The input signal of the S terminal of the RS flip-flop is provided by the clock signal. The Q terminal of the RS flip-flop is the drive signal g(S) of the switch S in the Boost PFC converter.

[0060] The hybrid conduction mode Boost PFC converter control method in this embodiment of the invention, such as... Figure 3 As shown, it includes the following steps:

[0061] Step S31: During any switching cycle of the hybrid conduction mode conversion circuit, acquire the initial current signal flowing through the equivalent inductor and the initial voltage signal output by the hybrid conduction mode conversion circuit.

[0062] For example: In any switching cycle, which is the Kth switching cycle of the hybrid on-mode converter, the initial current signal flowing through the equivalent inductance is used... The initial voltage signal output by the hybrid conduction mode conversion circuit is represented by u. o express.

[0063] Step S32: The voltage error signal of the initial voltage signal is obtained by processing the initial voltage signal through the voltage controller of the control system.

[0064] The voltage error signal here can be represented by u. m This indicates that the voltage error signal u m pass Figure 2 The voltage controller 23 in the middle controls the initial voltage signal u o It is obtained through processing.

[0065] Step S33: The initial current signal is integrated by the first reset integrator of the control system to obtain the average current signal.

[0066] The average current signal here can be used It indicates that its process Figure 2 The first reset integrator in the process is used for integration.

[0067] Step S34: Based on the voltage error signal and the average current signal, calculate the input reference signal based on any switching cycle using the first subtractor and the first multiplier of the control system.

[0068] In one specific implementation, step 34 above, based on the voltage error signal and the average current signal, calculates the input reference signal based on any switching cycle using the first subtractor and the first multiplier of the control system, and performs this calculation using the following formula (1):

[0069]

[0070] Among them, u m This is a voltage error signal. u o For the initial voltage signal, R e The equivalent resistance of the hybrid conduction mode conversion circuit. For the average current signal, T s The time of any switching cycle.

[0071] The result of formula (1) is the input reference signal, which is obtained by... Figure 2 The output of the first multiplier 25 is sent to one end of the comparator 28.

[0072] Step S35: The initial current signal is integrated by the second reset integrator of the control system to obtain the integrated current signal, and then the product of the voltage error signal and the integrated current signal is calculated by the second multiplier.

[0073] In one specific implementation, step S35 above, the product of the voltage error signal and the integrated current signal is calculated by the second multiplier using the following formula (2):

[0074]

[0075] Among them, u m This is a voltage error signal. u o For the initial voltage signal, R e i is the equivalent resistance of the hybrid conduction mode conversion circuit. L For the initial current signal, T s Let t be the time of any switching cycle, k-1 be the previous cycle of any switching cycle, and t be the time of any switching cycle. on (n) represents the on-time of the Boost PFC converter in any switching cycle;

[0076] Step S36: Based on the comparison result of the input reference signal and the product value obtained by the comparator of the control system, the Boost PFC converter is triggered to turn on or off in any switching cycle by the RS trigger of the control system.

[0077] Step S36 above: Obtain the comparison result of the input reference signal and the product value through the comparator of the control system, and trigger the Boost PFC converter to turn on or off in any switching cycle through the RS trigger of the control system, including:

[0078] Step 1: If the input reference signal and the product value are greater than or equal to the voltage error signal, the RS flip-flop switches from the first level to the second level, thereby triggering the Boost PFC converter to disconnect.

[0079] If the input reference signal and the product value are greater than or equal to the voltage error signal, the RS flip-flop switches from the first level to the second level by the following formula (3):

[0080]

[0081] Among them, u m For the input reference signal, u o For the initial voltage signal, R e i is the equivalent resistance of the hybrid conduction mode conversion circuit. L For the initial current signal, T s Let t be the time of any switching cycle, k-1 be the previous cycle of any switching cycle, and t be the time of any switching cycle. on (n) represents the on-time of the Boost PFC converter during any switching cycle. The first level can be high (1) and the second level can be low (0).

[0082] Step 2: If the input reference signal and its product value are less than the voltage error signal, the RS flip-flop switches from the second level to the first level, thereby triggering the Boost PFC converter to turn on.

[0083] If the input reference signal and the product value are less than the voltage error signal, the following formula (4) is executed:

[0084]

[0085] Among them, u m This is a voltage error signal. u o For the initial voltage signal, R e i is the equivalent resistance of the hybrid conduction mode conversion circuit. L For the initial current signal, T s Let t be the time of any switching cycle, k-1 be the previous cycle of any switching cycle, and t be the time of any switching cycle. on (n) represents the on-time of the Boost PFC converter during any switching cycle.

[0086] For example: within any switching cycle K, when the clock pulse arrives, Figure 2 The RS flip-flop 28 in the middle outputs a high level at the Q terminal to trigger 1. Figure 1 The switching transistor S in the circuit is turned on, and at the same time, the second reset integrator 26 starts from zero to process the initial current signal i. L The integral value obtained by performing integration. With input reference signal During the comparison, once the integral value exceeds the reference value, the output of the RS flip-flop Q changes from high level 1 to low level 0, triggering the Boost PFC converter S to turn off. Simultaneously, the RS flip-flop's... The output 1 resets the second reset integrator 26, stopping integration. The Boost PFC converter S and the second reset integrator 26 remain in this state until the next clock pulse arrives, then the next cycle begins, and steps S31-S36 are repeated.

[0087] The hybrid conduction mode Boost PFC converter control method in this embodiment of the invention processes or calculates the initial current signal and initial voltage signal output by the Boost PFC converter in any switching cycle by executing steps S31-S36, thereby realizing the turn-on or turn-off of the Boost PFC converter. Under different switching modes of the Boost PFC converter's turn-on or turn-off, there is no need to set up a switching switch to control the switching of different modes of the Boost PFC converter, nor is it necessary to use pattern recognition algorithms such as zero current detection / feedforward control to identify CCM and DCM modes, nor is it necessary to add different current correction or modulation coefficient calculation values ​​to the current in different modes. Therefore, the turn-on or turn-off control process of the Boost PFC converter in this embodiment of the invention is relatively simple.

[0088] The following specific examples 1 and 2 fully demonstrate that the hybrid conduction mode BoostPFC converter control method in the embodiments of the present invention can achieve better results.

[0089] In this embodiment 1, the parameter values ​​of the MCM Boost PFC converter are as follows: Figure 1 in, u in =50V,L f =2000μH,C f =0.2μF, L=1000μH, C=580μF, R=400Ω. Figure 4 The figure shows the simulation results of the Boost PFC converter based on the hybrid conduction mode Boost PFC converter control method in the embodiments of the present invention. Figure 4 (a) is the waveform of the initial current signal flowing through the equivalent inductance on the back side of the rectifier bridge. From the waveform, it can be concluded that this Boost PFC converter is operating in hybrid mode. Figure 4 (b) is the waveform of the initial output voltage signal of the Boost PFC converter; Figure 4 (c) shows the grid-side voltage and current waveforms. As can be seen from 4(c), the input current can track the input voltage waveform and present a sinusoidal shape. Figure 5The simulation results of the MCMBoost PFC converter based on traditional average current control are shown. Figure 5 (a) is the waveform of the initial current signal flowing through the equivalent inductance on the back side of the rectifier bridge. From the waveform, it can be concluded that this Boost PFC converter is operating in hybrid mode. Figure 5 (b) is the waveform of the initial output voltage of the Boost PFC converter; Figure 5 (c) shows the grid-side voltage and current waveforms, derived from... Figure 5 (c) It can be seen that since both CCM and DCM modes exist in the hybrid mode, the input current tracks the input voltage waveform in a sinusoidal shape in the corresponding CCM mode. However, when operating in DCM mode, the input current is severely distorted, resulting in a distorted waveform with a bulge in the middle.

[0090] In this embodiment 2, the parameter values ​​of the MCM Boost PFC converter are as follows: Figure 1 in, u in =50V,L f =2000μH,C f =0.2μF, L=1000μH, C=580μF, R=600Ω. Figure 6 The figure shows the simulation results of the Boost PFC converter based on the hybrid conduction mode Boost PFC converter control method proposed in the embodiments of the present invention. Figure 6 (a) is the waveform of the initial current flowing through the equivalent inductance on the back side of the rectifier bridge. From the waveform, it can be concluded that this Boost PFC converter is operating in hybrid mode. Figure 6 (b) is the waveform of the initial output voltage signal of the Boost PFC converter; Figure 6 (c) shows the grid-side voltage and current waveforms, derived from... Figure 6 (c) It can be seen that the input current can track the input voltage waveform and present a sinusoidal shape. Figure 7 The simulation results of the MCM Boost PFC converter based on traditional average current control are shown. Figure 7 (a) is the waveform of the initial current signal flowing through the equivalent inductance on the back side of the rectifier bridge. From the waveform, it can be concluded that this converter is operating in hybrid mode. Figure 7 (b) is the output voltage waveform of the converter; Figure 7(c) shows the grid-side voltage and current waveforms. As can be seen from the figure, since both CCM and DCM modes exist simultaneously in the hybrid mode, the input current tracks the input voltage waveform in a sinusoidal shape in the corresponding CCM mode. However, when operating in DCM mode, the input current is severely distorted, resulting in a distorted waveform with a bulge in the middle. The results of the embodiment show that traditional average current control is only suitable for Boost PFC converters operating in CCM mode, enabling the input current to track the input voltage waveform in a sinusoidal shape, thereby achieving high power factor grid connection. However, in MCM mode, due to the simultaneous existence of DCM mode, traditional converter circuit control cannot effectively overcome the nonlinear effects caused by the converter operating in DCM mode. Furthermore, due to incorrect average current calculation, the average inductor current cannot accurately track the reference current, resulting in severe current distortion. The hybrid conduction mode Boost PFC converter control method proposed in this embodiment of the invention is applicable to both CCM and DCM modes. Therefore, for MCM mode where CCM and DCM exist simultaneously, there is no need to use pattern recognition algorithms such as zero current detection / feedforward control to identify CCM and DCM modes. It can always make the input current track the input voltage waveform to present a sinusoidal shape, thereby achieving high power factor grid connection.

[0091] Based on the same concept, this invention also provides a hybrid conduction mode Boost PFC converter control device for a hybrid conduction mode conversion circuit. The hybrid conduction mode conversion circuit forms a closed loop by sequentially connecting an input circuit, an equivalent inductor, a rectifier diode, and an output resistor. An equivalent capacitor is connected in parallel across the output resistor. The first terminal of the Boost PFC converter is connected to the equivalent inductor, and the second terminal of the Boost PFC converter is connected to the equivalent capacitor. This hybrid conduction mode Boost PFC converter control device, as shown... Figure 8 As shown, it includes the following modules:

[0092] The initial signal acquisition module 81 is used to acquire the initial current signal flowing through the equivalent inductor and the initial voltage signal output by the hybrid conduction mode conversion circuit during any switching cycle of the hybrid conduction mode conversion circuit.

[0093] The error signal acquisition module 82 is used to process the initial voltage signal through the voltage controller of the control system to obtain the voltage error signal of the initial voltage signal.

[0094] The average current calculation module 83 is used to perform integration calculation on the initial current signal through the first reset integrator of the control system to obtain the average current signal.

[0095] The reference signal calculation module 84 is used to calculate the input reference signal based on any switching cycle by means of the first subtractor and the first multiplier of the control system, based on the voltage error signal and the average current signal.

[0096] The product value calculation module 85 is used to perform integration operation on the initial current signal through the second reset integrator of the control system to obtain the integrated current signal, and then calculate the product value of the voltage error signal and the integrated current signal through the second multiplier.

[0097] The control module 86 is used to obtain the comparison result of the input reference signal and the product value based on the comparator of the control system, and to trigger the Boost PFC converter to turn on or off in any switching cycle through the RS trigger of the control system.

[0098] Based on the same concept, embodiments of the present invention also provide a computer device, such as... Figure 9 As shown, the computer device may include a processor 91 and a memory 92, wherein the processor 91 and the memory 92 can be connected via a bus or other means. Figure 9 Taking the example of a connection between China and Israel via a bus.

[0099] Processor 91 can be a central processing unit (CPU). Processor 91 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0100] The memory 92, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules. The processor 91 executes various functional applications and data processing by running the non-transitory software programs, instructions, and modules stored in the memory 92, thereby implementing the hybrid conduction mode Boost PFC converter control method in the above embodiments.

[0101] The memory 92 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor 91, etc. Furthermore, the memory 92 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 92 may optionally include memory remotely located relative to the processor 91, and these remote memories may be connected to the processor 91 via a network. Examples of such networks include, but are not limited to, power grids, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0102] The one or more modules are stored in the memory 92, and when executed by the processor 91, the hybrid conduction mode Boost PFC converter control method shown in the embodiment is executed.

[0103] The specific details of the above-mentioned computer equipment can be understood by referring to the relevant descriptions and effects in the embodiments shown in the accompanying drawings, and will not be repeated here.

[0104] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0105] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A control method for a hybrid conduction mode Boost PFC converter, used in a hybrid conduction mode converter circuit, wherein the hybrid conduction mode converter circuit forms a closed loop by sequentially connecting an input circuit, an equivalent inductor, a rectifier diode, and an output resistor, an equivalent capacitor is connected in parallel across the output resistor, and the first terminal of the Boost PFC converter is connected to the equivalent inductor, and the second terminal of the Boost PFC converter is connected to the equivalent capacitor, characterized in that... Includes the following steps: During any switching cycle of the hybrid conduction mode conversion circuit, the initial current signal flowing through the equivalent inductor and the initial voltage signal output by the hybrid conduction mode conversion circuit are acquired. The voltage error signal of the initial voltage signal is obtained by processing the initial voltage signal through the voltage controller of the control system; The average current signal is obtained by integrating the initial current signal through the first reset integrator of the control system. Based on the voltage error signal and the average current signal, the input reference signal based on any given switching cycle is calculated by the first subtractor and the first multiplier of the control system. The initial current signal is integrated by the second reset integrator of the control system to obtain the integrated current signal, and then the product of the voltage error signal and the integrated current signal is calculated by the second multiplier. The comparator of the control system obtains the comparison result of the input reference signal and the product value, and triggers the Boost PFC converter to turn on or off in any switching cycle through the RS trigger of the control system. Based on the voltage error signal and the average current signal, the input reference signal based on any given switching cycle is calculated using the first subtractor and the first multiplier of the control system, and is executed using the following formula: ； in, The voltage error signal, , The initial voltage signal. The average current signal. The time of any given switching cycle.

2. The hybrid conduction mode Boost PFC converter control method according to claim 1, characterized in that, The product of the voltage error signal and the integrated current signal is calculated using the second multiplier according to the following formula: ； in, The voltage error signal, , The initial voltage signal. The initial current signal, The duration of any given switching cycle. The previous cycle of any given switching cycle. The on-time of the Boost PFC converter during any switching cycle.

3. The hybrid conduction mode Boost PFC converter control method according to claim 1, characterized in that, The comparison result of the input reference signal and the product value is obtained by the comparator of the control system, and the Boost PFC converter is triggered to turn on or off in any switching cycle by the RS trigger of the control system, including: If the product value is greater than or equal to the input reference signal, the RS flip-flop switches from the first level to the second level, thereby triggering the Boost PFC converter to disconnect. If the product value is less than the input reference signal, the RS flip-flop switches from the second level to the first level, thereby triggering the Boost PFC converter to turn on.

4. The hybrid conduction mode Boost PFC converter control method according to claim 3, characterized in that, If the product value is greater than or equal to the input reference signal, the RS flip-flop switches from the first level to the second level using the following formula: in, The voltage error signal, , The initial voltage signal. The initial current signal, The duration of any given switching cycle. The previous cycle of any given switching cycle. The on-time of the Boost PFC converter during any switching cycle.

5. The hybrid conduction mode Boost PFC converter control method according to claim 3, characterized in that, If the product value is less than the input reference signal, the following formula is used: in, The voltage error signal, , The initial voltage signal. The initial current signal, The duration of any given switching cycle. The previous cycle of any given switching cycle. The on-time of the Boost PFC converter during any switching cycle.

6. A hybrid conduction mode Boost PFC converter control device for a hybrid conduction mode conversion circuit, wherein the hybrid conduction mode conversion circuit forms a closed loop by sequentially connecting an input circuit, an equivalent inductor, a rectifier diode, and an output resistor, an equivalent capacitor is connected in parallel across the output resistor, and a first terminal of the Boost PFC converter is connected to the equivalent inductor, and a second terminal of the Boost PFC converter is connected to the equivalent capacitor, characterized in that... Includes the following modules: The initial signal acquisition module is used to acquire the initial current signal flowing through the equivalent inductor and the initial voltage signal output by the hybrid conduction mode conversion circuit during any switching cycle of the hybrid conduction mode conversion circuit. An error signal acquisition module is used to process the initial voltage signal through the voltage controller of the control system to obtain the voltage error signal of the initial voltage signal; The average current calculation module is used to perform integration calculation on the initial current signal through the first reset integrator of the control system to obtain the average current signal. The reference signal calculation module is used to calculate the input reference signal based on any switching cycle by means of the first subtractor and the first multiplier of the control system, based on the voltage error signal and the average current signal. The product value calculation module is used to perform integration operation on the initial current signal through the second reset integrator of the control system to obtain the integrated current signal, and then calculate the product value of the voltage error signal and the integrated current signal through the second multiplier. The control module is used to obtain the comparison result of the input reference signal and the product value based on the comparator of the control system, and to trigger the Boost PFC converter to be turned on or off in any switching cycle through the RS trigger of the control system. Based on the voltage error signal and the average current signal, the input reference signal based on any given switching cycle is calculated using the first subtractor and the first multiplier of the control system, and is executed using the following formula: ； in, The voltage error signal, , The initial voltage signal. The average current signal. The time of any given switching cycle.

7. A hybrid conduction mode switching control system, characterized in that, The system includes a first reset integrator, a second reset integrator, a first multiplier, a second multiplier, a voltage controller, a first subtractor, a second subtractor comparator, and an RS flip-flop. The first reset integrator integrates the initial voltage signal output from the hybrid on-mode converter to obtain an average current signal. The first subtractor subtracts the initial voltage signal. The voltage controller processes the initial voltage signal after subtraction by the first subtractor and transmits the processed initial voltage signal to the second subtractor for subtraction, then multiplies it using the first multiplier to obtain an input reference signal. The second reset integrator integrates the initial current signal to obtain an integrated current signal. The second multiplier calculates the product of the voltage error signal and the integrated current signal. The comparator compares the input reference signal with the product value. The RS flip-flop triggers the Boost PFC converter to turn on or off based on the comparison result of the comparator. Based on the voltage error signal and the average current signal, the input reference signal based on any switching cycle is calculated by the first subtractor and the first multiplier of the control system, using the following formula: ； in, The voltage error signal, , The initial voltage signal. The average current signal. The time of any given switching cycle.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the hybrid conduction mode Boost PFC converter control method according to any one of claims 1 to 5.

9. A computer device, characterized in that, include: The system includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the hybrid conduction mode Boost PFC converter control method according to any one of claims 1 to 5.

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