Control method and device of voltage transformation circuit, controller, vehicle and storage medium

Abstract

The invention discloses a control method and device of a voltage transformation circuit, a controller, a vehicle and a storage medium. According to the invention, the phase cutting time sequence of each phase branch is determined based on the output signal of the voltage transformation circuit, so that the phase cutting control of the voltage transformation circuit is carried out, and the target phase branch supplying power to the load is switched among the plurality of phase branches according to the phase cutting time sequence. The phase cutting control mode of the voltage transformation circuit is determined based on the output signal of the voltage transformation circuit, the transient process of phase cutting among the multiple phase branches is ended in a shorter time, and the phase cutting response speed of the voltage transformation circuit can be increased. And meanwhile, the mode that the multiple phase branches are conducted in turn is adopted, thermal stress balance among the multiple phase branches can be achieved, and the phase cutting control stability in the multi-phase voltage transformation circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of circuit control technology, and in particular to a control method, device, controller, vehicle and storage medium for a transformer circuit. Background Art

[0002] A switching converter (voltage converter) converts the input power supply voltage to the desired output voltage by controlling the on-time and off-time of switching elements. Switching converters can include voltage converters, step-up converters, and boost converters. Taking a step-down converter (such as a buck converter) as an example, a step-down converter converts the input voltage signal into a chopped output signal, which then passes through a filter composed of inductors and capacitors to obtain the desired DC voltage. When switching power supply chips drive high-current, high-power loads, components such as power transistors, external inductors, and output capacitors are subject to significant current stress, which can easily lead to unstable operation and shortened lifespan. Voltage converters are affected by differences in component parameters. In a multi-phase parallel transformer circuit, current imbalance exists in each phase branch. When operating at high current for a long time, one branch can generate significantly more heat than the others. Continuous operation in a high-temperature environment shortens the lifespan of electronic components and reduces the stability of the transformer system. Summary of the Invention

[0003] The purpose of this application is to provide a control method, device, controller, vehicle and storage medium for a transformer circuit, which improve the stability of the transformer circuit and at least partially solve the above-mentioned technical problems.

[0004] To achieve the above-mentioned object, according to a first aspect of the present application, a control method for a voltage transformer circuit is provided. The voltage transformer circuit includes a plurality of phase branches connected to a load and supplying power to the load. The control method includes:

[0005] Obtaining an output signal of a transformer circuit;

[0006] determining a phase-cutting timing of each phase branch based on an output signal of the voltage transformation circuit;

[0007] Phase shedding control is performed on the transformer circuit based on the phase shedding sequence, so that a target phase branch supplying power to a load is switched among a plurality of phase branches according to the phase shedding sequence.

[0008] Optionally, obtaining an output signal of the transformer circuit includes:

[0009] Obtaining the output voltage of the transformer circuit;

[0010] The control voltage is obtained by performing proportional-integral-derivative control based on the output voltage.

[0011] Optionally, determining the phase-cutting timing of each phase branch based on the output signal of the voltage transformation circuit includes:

[0012] Obtain the output current of the transformer circuit;

[0013] Determine a plurality of phase-cutting cycles according to the plurality of phase branches, wherein the phase-cutting cycle is a time period from switching from a cut-out phase branch to a cut-in phase branch;

[0014] Determine the theoretical duty cycle of the phase branch in each phase cutting cycle in the set switching cycle according to the control voltage and the output current;

[0015] Based on the comparison between the theoretical duty cycle and the set threshold, the control mode of each phase cutting cycle is determined;

[0016] Among them, the control method includes a first duty cycle corresponding to the cut-out phase branch and a second duty cycle corresponding to the cut-in phase branch, wherein the first duty cycle is the proportion of the conduction time of the cut-out phase branch within the set switching cycle, and the second duty cycle is the proportion of the conduction time of the cut-in phase branch within the set switching cycle.

[0017] Optionally, based on a comparison result between a theoretical duty cycle and a set threshold, a control mode for each phase cutting period is determined, including:

[0018] If the theoretical duty cycle is less than the set threshold, the first duty cycle of the phase-out branch in the set switching period is set to a first set value, and the second duty cycle of the phase-in branch in the set switching period is determined based on the transformer circuit.

[0019] Optionally, determining a second duty cycle of the switched-in phase branch in a set switching period based on the voltage transformation circuit includes:

[0020] Determining a first number of switching cycles within a phase-cut cycle according to an average inductor current of a plurality of phase branches and a current falling slope of the cut-in phase branch, wherein the first number of switching cycles includes at least one set switching cycle;

[0021] The second duty cycle is determined based on a comparison result of the number of switching cycles of the set switching cycle within the phase-cut period and the first number of switching cycles.

[0022] Optionally, determining the second duty cycle based on a comparison result of the number of switching cycles of the set switching cycle within the phase-cut period and the first number of switching cycles includes:

[0023] The constant duty cycle of the transformer circuit is obtained according to the ratio of the output voltage to the input voltage of the transformer circuit;

[0024] If the number of switching cycles of the set switching cycle within the phase-cut period is less than the first number of switching cycles, determining the second duty cycle according to the constant duty cycle;

[0025] If the number of switching cycles in the phase-cutting period of the switching cycle is set to be equal to the first number of switching cycles, the second duty cycle is determined according to the constant duty cycle and the first number of switching cycles.

[0026] Optionally, the first switching cycle number is calculated by the following formula:

[0027]

[0028] Wherein, M1 is the first switching cycle number, is the average inductor current; m2 is the current decline slope; T s To set the switching cycle;

[0029] The second duty cycle is calculated by the following formula:

[0030]

[0031] Among them, d add is the second duty cycle, d is the constant duty cycle, M1 is the first switching cycle number, To set the number of switching cycles in the phase-cut cycle.

[0032] Optionally, based on a comparison result between a theoretical duty cycle and a set threshold, a control mode for each phase cutting period is determined, including:

[0033] If the theoretical duty cycle is greater than or equal to the set threshold, the second duty cycle corresponding to the switched-in phase branch is set to a second set value, and the first duty cycle corresponding to the switched-out phase branch is determined based on the transformer circuit.

[0034] Optionally, determining a first duty cycle corresponding to switching out the phase branch based on the transformer circuit includes:

[0035] Determining a second number of switching cycles within the phase-cut cycle according to an average inductor current of the plurality of phase branches and a current rising slope of the cut-in phase branch, wherein the second number of switching cycles includes at least one set switching cycle;

[0036] The first duty cycle is determined based on a comparison result of the number of switching cycles of the set switching cycle within the phase-cut period and the second number of switching cycles.

[0037] Optionally, determining the first duty cycle based on a comparison result of the number of switching cycles of the set switching cycle within the phase-cut period and the second number of switching cycles includes:

[0038] The constant duty cycle of the transformer circuit is obtained according to the ratio of the output voltage to the input voltage of the transformer circuit;

[0039] If the number of switching cycles within the phase-cut period is less than the second number of switching cycles, determining the first duty cycle according to the constant duty cycle;

[0040] If the number of switching cycles within the phase-cutting period is set to be equal to the second number of switching cycles, the first duty cycle is determined to be a first set value.

[0041] Optionally, the second switching period is calculated using the following formula:

[0042]

[0043] Wherein, M2 is the second switching cycle number, is the average inductor current; m1 is the current rising slope; T s To set the switching cycle;

[0044] The first duty cycle is calculated by the following formula:

[0045]

[0046] Among them, d shed is the first duty cycle, d is the constant duty cycle, M2 is the second switching cycle number, To set the number of switching cycles in the phase-cut cycle.

[0047] Optionally, determining a theoretical duty cycle of the switched-in phase branch in a set switching period in each phase-cutting period according to the control voltage and the output current includes:

[0048] Obtain the average load current in the transformer circuit;

[0049] determining a load current compensation value for each phase branch based on the average load current;

[0050] The theoretical duty cycle of the switched-in phase branch in the set switching period in each phase-cutting period is determined according to the load current compensation value, the control voltage and the constant duty cycle of the transformer circuit.

[0051] Optionally, determining a load current compensation value for each phase branch based on the average load current includes:

[0052] The load current compensation value is determined based on the difference between the average load current of the phase leg and the inductor current. Optionally, the theoretical duty cycle is calculated using the following formula:

[0053] d k =Av con +A[i os / Ni Lk ]+d;

[0054] Among them, d k is the theoretical duty cycle of the k-phase branch in the set switching period, v con is the control voltage, i os / Ni Lkis the load current compensation value of the k-phase branch, i os is the average load current, N is the number of phase branches, i Lk is the inductor current of the k-phase branch, d is the constant duty cycle, and k-phase is the cut-in phase.

[0055] Optionally, determining a theoretical duty cycle of the switched-in phase branch in a set switching period in each phase-cutting period according to the control voltage and the output current further includes:

[0056] In response to a load change in the transformer circuit, determining a load current compensation value after the load change;

[0057] Based on the load current compensation value after the load changes, the theoretical duty cycle of the switched-in phase branch in the set switching period is adjusted.

[0058] Optionally, performing phase-cutting control on the transformer circuit based on the phase-cutting timing sequence includes:

[0059] Determine whether the transformer circuit is a steady-state circuit;

[0060] If the transformer circuit is a steady-state circuit, determine whether the transformer circuit needs to be phase-cut;

[0061] If the transformer circuit needs to be phase-cut, the transformer circuit is controlled to be phase-cut based on the phase-cut timing.

[0062] Optionally, determining whether the transformer circuit needs to be phase-cut includes:

[0063] If the number of the first switching cycles or the second switching cycles in the phase cutting cycle is a third set value, it is determined that the voltage transformer circuit does not need phase cutting;

[0064] If the number of the first switching cycles or the second switching cycles in the phase cutting cycle is not equal to the third set value, it is determined that the voltage conversion circuit needs to be phase cut.

[0065] According to a second aspect of the present application, a voltage conversion circuit is provided, which is applied to the above-mentioned voltage conversion circuit control method.

[0066] According to a third aspect of the present application, a control device for a voltage transformer circuit is provided, wherein the voltage transformer circuit includes a plurality of phase branches connected to a load and supplying power to the load, and the control device includes:

[0067] An acquisition module, used for acquiring an output signal of a voltage conversion circuit;

[0068] A determination module, configured to determine a phase-cutting timing of each phase branch based on an output signal of the transformer circuit;

[0069] The control module is used to perform phase-cutting control on the transformer circuit based on the phase-cutting sequence, so that the target phase branch supplying power to the load is switched among multiple phase branches according to the phase-cutting sequence.

[0070] According to a fourth aspect of the present application, there is provided a vehicle, comprising:

[0071] The above-mentioned voltage conversion circuit; and / or

[0072] A control device for the above-mentioned voltage conversion circuit.

[0073] According to a fifth aspect of the present application, a controller for a voltage conversion circuit is provided, comprising:

[0074] a memory configured to store instructions; and

[0075] The processor is configured to call instructions from the memory and implement the above-mentioned control method of the voltage conversion circuit when executing the instructions.

[0076] According to a sixth aspect of the present application, a machine-readable storage medium is provided, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the above-mentioned control method for the transformer circuit.

[0077] The present application determines the phase-cutting timing of each phase branch based on the output signal of the transformer circuit to perform phase-cutting control of the transformer circuit, so that the target phase branch supplying power to the load switches between multiple phase branches according to the phase-cutting timing. The present application determines the phase-cutting control method of the transformer circuit based on the output signal of the transformer circuit, and ends the transient process of phase-cutting between multiple phase branches in a shorter time, which can improve the phase-cutting response speed of the transformer circuit. At the same time, by adopting a method in which multiple phase branches are turned on in turn, it is possible to achieve thermal stress balance between multiple phase branches and improve the stability of phase-cutting control in the multi-phase transformer circuit.

[0078] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0079] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0080] Figure 1 A schematic structural diagram of a voltage conversion circuit provided in an embodiment of the present application;

[0081] Figure 2 A schematic diagram of an application scenario of a voltage conversion circuit control method provided in an embodiment of the present application;

[0082] Figure 3A flow chart of a method for controlling a voltage transformer circuit provided in an embodiment of the present application;

[0083] Figure 4 A phase-cutting working principle diagram of a two-phase interleaved voltage converter provided in an embodiment of the present application;

[0084] Figure 5 A schematic diagram of operating waveforms of a two-phase interleaved voltage converter provided in an embodiment of the present application;

[0085] Figure 6 A waveform diagram within a phase-cut period provided in one embodiment of the present application;

[0086] Figure 7 A waveform diagram within a phase-cutting period provided in another embodiment of the present application;

[0087] Figure 8 This is a schematic structural diagram of a control device for a voltage conversion circuit provided in an embodiment of the present application;

[0088] Figure 9 This is a structural block diagram of a vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0089] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0090] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically qualified. In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is provided to enable anyone skilled in the art to implement and use the present application. In the following description, details are listed for illustrative purposes. It should be understood that one of ordinary skill in the art will recognize that the present application can be implemented without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0091] The core of the voltage converter is that the lossless current limiting of the inductor can just suppress the surge current of the capacitor, and the two complement each other. At the same time, the inductor and capacitor act as a power filter, filtering out high-frequency harmonics and forming a relatively smooth constant voltage output on the load. The embodiment of the present application provides a voltage conversion circuit, which can be applied to the control method of the voltage conversion circuit in the embodiment of the present application. Please refer to Figure 1 , Figure 1 The transformer circuit shown takes a two-phase staggered parallel circuit as an example, and the transformer circuit includes two phase branches. One phase branch has a main switch S 1P , Synchronous switch S 1N and inductor L1. The other phase branch consists of the main switch S 2P , Synchronous switch S 2N and inductor L2. In this transformer circuit, v in Indicates the input voltage, v o Indicates the output voltage, R o Represents the load resistance, C o represents the output capacitor, L1 and L2 are the inductors of each phase, i L1 and i L2 is the current value corresponding to L1 and L2. Lall and i o are the total current of the inductor and the total current of the load respectively. KP and S KN (K=1,2) is the main switch and synchronous switch of K phase, V KP and V KN and SKP and S KN The corresponding driving signal.

[0092] By setting the switching cycle to turn the main switch on and off, the direction and magnitude of the current in each phase branch can be adjusted. When the main switch is off, the current stores energy through the inductor, and when the main switch is on, the inductor releases the stored energy, allowing the current to continue flowing. The synchronous switch is a switching element corresponding to the main switch, which is used to provide a low-impedance path so that the current can flow smoothly to ensure the continuity of the current and reduce switching losses. When the main switch is off, the synchronous switch is turned on, and when the main switch is on, the synchronous switch is turned off. By controlling the duty cycle and duty cycle of the main switch and the synchronous switch, the current provided to the load by the phase branch can be controlled. Usually, a pulse width modulation (PWM) control strategy can be used to adjust the switching cycle and duty cycle of the main switch and the synchronous switch, thereby controlling the average value and waveform of the current to meet the needs of the load.

[0093] It should be noted that the load in the implementation of this application includes any circuit connected after the transformer circuit. That is, no matter what circuit or circuit structure is connected after the transformer circuit, it can be collectively referred to as a load.

[0094] Related technologies typically use a proportional-integral-derivative (PID) controller with a feedforward correction circuit to mitigate the instantaneous current surge during phase shedding, while also utilizing a hysteresis comparator to reduce the frequent switching cycles caused by current fluctuations. However, this feedforward correction circuit cannot completely eliminate the current differences caused by phase shedding, nor can it achieve thermal stress balance, resulting in significant differences in the aging of switching devices in each phase branch.

[0095] Based on this, the embodiment of the present application provides a digital control module. Figure 1 The transformer circuit connection shown achieves more efficient and accurate phase control of the transformer circuit by collecting the output signal of the transformer circuit. Figure 2 This is a schematic diagram of an application scenario of a voltage transformer circuit control method provided in an embodiment of the present application. In this application scenario, a digital control module is provided, which includes an analog-to-digital (ADC) converter, a PID controller, a control strategy module, a timing circuit, and a PWM drive circuit.

[0096] The ADC controller is used to sample the output voltage and output current of the transformer circuit at a certain sampling rate and convert them into digital signals. clkK is the ADC sampling clock signal of the Kth phase. Figure 1In the two-phase branch shown, since the output voltage is sampled every time the current of each phase is sampled, the sampling frequency of the output voltage is twice that of the current. LKs (n) and v s (n,K) is i LK and v o The sampling value in the nth set switching cycle. The ADC controller can respectively collect the output voltage v of the transformer circuit o , the inductor current value i of the two-phase branch L1 and i L2 , and the total load current i o Then, the output current signal i of each phase branch is converted into a digital signal. L1s (n) and i L2s (n), and the output voltage v o The PID controller is based on the output voltage v o And the voltage reference value v ref Calculate the control voltage v output by the PID controller con .

[0097] The control strategy module is based on the received output signal, such as the control voltage v con , the inductor current value i of the two-phase branch L1 and i L2 And the total load current i o The control strategy for the transformer circuit is determined by using the following parameters: duty cycle D of each phase branch during the set switching cycle and the number of switching cycles M within each phase-cutting cycle, as determined by the control strategy. The timing circuit then determines the operating parameters of the PWM drive circuit based on these information. By adjusting duty cycle D and number of switching cycles M, the PWM drive circuit can control the average value and waveform of the PWM signal, thereby controlling the output voltage of the transformer circuit and achieving phase-cutting operation of the transformer circuit.

[0098] It should be noted that the voltage transformer circuit in the embodiments of the present application is not limited to the aforementioned voltage transformer circuit consisting of two phase branches connected in parallel, but may also be a voltage transformer circuit consisting of multiple phase branches connected in parallel. Based on the application scenarios of the aforementioned voltage transformer circuit control method, an embodiment of the voltage transformer circuit control method is proposed. This is described in detail below with reference to the accompanying drawings.

[0099] Figure 3 Schematic diagram of a flow chart of a control method for a voltage transformer circuit provided in an embodiment of the present application. Figure 3 As shown, the voltage conversion circuit in the control method includes multiple phase branches connected to the load and supplying power to the load. Steps 301-303 and other steps are performed through the above, which are described in detail below.

[0100] Step 301: Obtain the output signal of the transformer circuit.

[0101] In the embodiment of the present application, the output signal of the transformer circuit may be data obtained by converting the collected analog signal of the transformer circuit into a digital signal. Figure 2 The ADC converter shown samples the output voltage and output current of the voltage conversion circuit and then converts them into corresponding digital signals.

[0102] Step 302: Determine the phase-cutting timing of each phase branch based on the output signal of the voltage transformation circuit.

[0103] In an embodiment of the present application, for working conditions that require phase cutting, multiple phase branches can be enabled in turn. Phase cutting timing refers to the time and order of phase cutting for each phase branch. Among them, the phase cutting timing may include relevant data of the phase branch cut in and relevant data of the phase branch cut out each time the phase cutting operation is performed, as well as relevant data within the switching cycle from the phase branch cut out to the phase branch cut in. The phase cutting timing is a control strategy for phase cutting control of the transformer circuit generated based on the output signal of the transformer circuit. Through the control strategy of real-time calculation, the transient process of phase cutting between multiple phase branches can be ended in a shorter time, thereby improving the phase cutting response speed of the transformer circuit.

[0104] Step 303: Perform phase-cutting control on the transformer circuit based on the phase-cutting sequence, so that the target phase branch supplying power to the load switches among the multiple phase branches according to the phase-cutting sequence. The target phase branch refers to the phase branch supplying power to the load when the multiple phase branches are alternately enabled.

[0105] After determining the phase-cutting sequence for each phase branch, the sequence can be sent to a timing circuit. Based on the received sequence, the timing circuit determines the operating parameters of the PWM drive circuit, switching between the multiple phase branches when the times specified in the operating parameters are reached, thereby allowing the multiple phase branches to alternately power the load.

[0106] The embodiment of the present application determines the phase-cutting timing of each phase branch based on the output signal of the transformer circuit to perform phase-cutting control of the transformer circuit, so that the target phase branch supplying power to the load switches between multiple phase branches according to the phase-cutting timing. The present application determines the phase-cutting control method of the transformer circuit based on the output signal of the transformer circuit, and ends the transient process of phase-cutting between multiple phase branches in a shorter time, which can improve the phase-cutting response speed of the transformer circuit. At the same time, by adopting a method in which multiple phase branches are turned on in turn, it is possible to achieve thermal stress balance between multiple phase branches and improve the stability of phase-cutting control in the multi-phase transformer circuit.

[0107] In step 301, the output voltage and output current of the transformer circuit can be obtained. Proportional-integral-differential control is then performed based on the output voltage to obtain a control voltage. The output current may include the total inductor current of the transformer circuit and the inductor current of each phase branch. The control voltage is a voltage value calculated based on the output voltage of the transformer circuit and a voltage reference value.

[0108] In one example, the control voltage v calculated by the PID controller is con The calculation method can be shown as formula (1):

[0109]

[0110] Among them, v con is the control voltage, K p , K i and K d are proportional, integral and differential coefficients respectively, e(n,k) is the deviation value of the current cycle, and k represents the sampling delay. Among them, e(n,k) is the difference between the output voltage v0 of the current cycle and the voltage reference value v ref The difference, that is, e(n,k)=v0-v ref e(n,k)-e(n,k-1) represents the rate of change of the deviation value. The control voltage v is calculated by the PID controller. con The output control voltage can be made closer to the set voltage reference value to improve the stability of the system.

[0111] Figure 4 This is a phase-cutting working principle diagram of a two-phase interleaved voltage converter provided in an embodiment of the present application. Figure 4 As shown in the figure, the operating process can be divided into two phases depending on the load conditions in the transformer circuit. Under light-load conditions, each phase leg operates alternately for a period of time. When one phase leg is conducting, the other is off. Under heavy-load conditions, both phase legs are enabled simultaneously and can conduct simultaneously. For example, if the number of switching cycles within a phase-cut cycle is zero, the operating condition is heavy-load, indicating that phase-cutting is not required. If the number of switching cycles within a phase-cut cycle is not zero, the operating condition is light-load, indicating that phase-cutting is required.

[0112] When the transformer circuit is in a light-load condition, it can be set to alternate phase branch operation, thus including multiple phase-cut cycles. A phase-cut cycle is the time period from switching from a cut-out phase branch to a cut-in phase branch. A cut-out phase branch refers to a phase branch that supplied power to the load in the cycle preceding the current phase-cut cycle and needs to be cut off during the current phase-cut cycle. A cut-in phase branch refers to a phase branch that needs to replace the cut-out phase branch to supply power to the load during the current phase-cut cycle.

[0113] In step 302, a plurality of phase-cutting cycles can be first determined based on a plurality of phase branches. Specifically, the order in which the plurality of phase branches are alternately enabled can be such that the switching time period from the phase branch being cut out to the phase branch being cut in is defined as one phase-cutting cycle. Then, the theoretical duty cycle of the phase branch being cut in during each phase-cutting cycle in the set switching cycle is determined based on the control voltage and the output current. The set switching cycle refers to the operating frequency of the switching device set in advance. In a set switching cycle, the ratio of the on-time to the off-time of the switching device is the duty cycle of the switching device in the set switching cycle. For example, in a transformer circuit, the ratio of the on-time to the off-time of each phase branch during a set cycle is the duty cycle of the phase branch during the set cycle.

[0114] Figure 5 Schematic diagram of the working waveform of a two-phase interleaved voltage converter provided in an embodiment of the present application. Figure 5 As shown, the switching period is set to T s , the theoretical duty cycle d of the K-th phase branch in the n-th set switching cycle n,K The calculation method can be obtained by formula (2):

[0115]

[0116] Among them, m K1 and m K2 i LK and i LK The rising and falling slopes.

[0117] Traditional digital average current control consists of two parts: a dynamic duty cycle and a constant duty cycle. The dynamic duty cycle adjusts for errors caused by non-ideal parameters and transient processes, and its value is close to zero in steady state. The constant duty cycle is used to quickly adjust the output voltage during startup and its value is close to the ideal duty cycle in steady state.

[0118] Therefore, the load transient response performance of the digital average current control is determined by the dynamic duty cycle, specifically, by the PID controller and the inductor current change rate. Due to the low bandwidth of the PID controller and the low inductor current change rate, the load transient response performance of the digital average current prediction control is poor. In order to improve its load transient response performance, the embodiment of the present application introduces load current compensation, samples the output current, and the sampled value is recorded as i os , whose sampling clock signal is the same as the output voltage.

[0119] In an embodiment of the present application, the average load current in the transformer circuit can be first obtained. The average load current of the transformer circuit can be obtained by dividing the total load current of the transformer circuit by the number of phase branches. Then, a load current compensation value for each phase branch is determined based on the average load current. Specifically, the load current compensation value can be determined based on the difference between the average load current of the phase branch and the inductor current. Finally, the theoretical duty cycle of the switched-in phase branch in the set switching cycle within each phase-cut cycle is determined based on the load current compensation value, the control voltage, and the constant duty cycle of the transformer circuit.

[0120] In one example, the theoretical duty cycle can be calculated using the following formula (3):

[0121] d K =Av con +A[i os / Ni Lk ]+d; (3)

[0122] Among them, d K is the theoretical duty cycle of the K-phase branch in the set switching period, v con is the control voltage, i os / Ni LK is the load current compensation value of the K-phase branch, i os is the average load current, N is the number of phase branches, i LK is the inductor current of the K-phase branch, d is the constant duty cycle, and K-phase is the cut-in phase.

[0123] In formula (3), A is a fixed coefficient, which can be obtained by A=L K / (v in T s ) can be calculated, the constant duty cycle d can be obtained by d=v0 / v in The first term Av con is the dynamic duty cycle, the second term Ai os / Ni LK is the load current compensation duty cycle, and the third term d is the constant duty cycle.

[0124] When the transformer circuit is in steady state, the average inductor current is constant. The first and third terms stabilize the output value, so load current compensation has no effect on the steady state. When the load in the transformer circuit changes, the load current compensation value after the load change can be determined. Based on this load current compensation value, the theoretical duty cycle of the switched-in phase branch during the set switching cycle is adjusted. This allows for immediate response and adjustment of the theoretical duty cycle, eliminating the need to wait for PID controller compensation or inductor current changes before adjusting the theoretical duty cycle. This improves load transient response.

[0125] Finally, based on the comparison result between the theoretical duty cycle and the set threshold, the control method of the phase cutting period is determined. In the embodiment of the present application, by adopting phase cutting control, each phase branch will supply power to the load in turn, thereby reducing current difference and thermal stress. However, frequent phase cutting will cause large ripples in the output voltage and inductor current. In order to solve this problem, a new phase cutting strategy is proposed. For the convenience of analysis, the following assumptions are made: 1) L1 = L2 = L; 2) the output capacitor is large enough to ignore the effect of the output voltage ripple on the inductor current ripple; 3) the influence of parasitic parameters is not considered. The phase cutting strategy can be implemented by a timing circuit, which determines the operating parameters of the PWM drive circuit based on the received control method.

[0126] In an embodiment of the present application, the control method may include a first duty cycle corresponding to the phase-out branch and a second duty cycle corresponding to the phase-in branch. The first duty cycle is the proportion of the conduction time of the phase-out branch within a set switching cycle, and the second duty cycle is the proportion of the conduction time of the phase-in branch within the set switching cycle. That is, during the phase-out cycle, the first duty cycle of the phase-out branch and the second duty cycle of the phase-in branch can be determined, so that the timing circuit can determine the operating parameters of the PWM drive circuit based on the first duty cycle and the second duty cycle.

[0127] In an embodiment of the present application, the comparison result between the theoretical duty cycle and the set threshold value can be divided into two cases. One case is that the theoretical duty cycle is less than the set threshold value, and the other case is that the theoretical duty cycle is greater than or equal to the set threshold value. Among them, the set threshold value is a threshold value used to distinguish different phase-cutting control methods. For example, the set threshold value can be set to 0.5. If the theoretical duty cycle is less than the set threshold value, it means that the rising slope of the inductor current of the cut-in phase is greater than the falling slope, and the number of switching cycles to complete the phase branch switching depends on the falling slope. If the theoretical duty cycle is greater than or equal to the set estimate value, it means that the falling slope of the inductor current of the cut-in phase is greater than or equal to the rising slope, and the number of switching cycles to complete the phase branch switching depends on the rising slope. The phase-cutting control for the two cases is described in detail below.

[0128] Figure 6 FIG. 1 is a waveform diagram of a phase-cut cycle provided in an embodiment of the present application. Figure 6 As shown, if the theoretical duty cycle is less than a set threshold, to speed up regulation, no enable signal for the phase-out branch is generated, and the phase-out branch remains in the off state. Therefore, the first duty cycle of the phase-out branch during the set switching cycle can be set to a first set value. The first set value is a value that disables the phase-out branch, for example, it can be set to 0. Simultaneously, a second duty cycle of the phase-in branch during the set switching cycle can be determined based on the voltage conversion circuit.

[0129] In an embodiment of the present application, the second duty cycle of the switching-in phase branch during a set switching cycle can be set to different values based on the number of switching cycles within the phase-cut cycle. Specifically, the first number of switching cycles within the phase-cut cycle is first determined based on the average inductor current of the multiple phase branches and the current falling slope of the switching-in phase branch. The first number of switching cycles refers to the number of switching cycles of the switching-in phase branch during the phase-cut cycle, and the first number of switching cycles includes at least one set switching cycle. Then, the second duty cycle is determined based on a comparison of the number of switching cycles of the set switching cycle during the phase-cut cycle with the first number of switching cycles.

[0130] Because the phase-cut points within a phase-cut cycle have different cut-in times during the first predetermined switching cycle, in one example, the comparison result of the number of switching cycles within the phase-cut cycle and the first number of switching cycles may include: the number of switching cycles being less than the first number of switching cycles, and the number of switching cycles being equal to the first number of switching cycles. When the number of switching cycles is equal to the first number of switching cycles, the last switching cycle may not be a complete cycle, and therefore a certain value needs to be subtracted.

[0131] Specifically, a constant duty cycle of the transformer circuit is first obtained based on a ratio of the output voltage to the input voltage of the transformer circuit. If the number of switching cycles of the set switching cycle within the phase-cut period is less than the first number of switching cycles, a second duty cycle is determined based on the constant duty cycle. If the number of switching cycles of the set switching cycle within the phase-cut period is equal to the first number of switching cycles, the second duty cycle is determined based on the constant duty cycle and the first number of switching cycles.

[0132] Specifically, the first switching cycle number is calculated by the following formula (4):

[0133]

[0134] in, Indicates rounding the calculated value to an integer, M1 is the number of the first switching cycle, is the average inductor current; m2 is the current decline slope; T s To set the switching cycle.

[0135] The second duty cycle is calculated by the following formula (5):

[0136]

[0137] Among them, d add is the second duty cycle, d is the constant duty cycle, M1 is the first switching cycle number, The number of switching cycles in the phase shedding cycle is set. Formula (5) is a calculation method based on a large number of experiments that can make the phase shedding control more efficient.

[0138] Figure 7FIG. 1 is a waveform diagram of a phase-cut cycle provided in another embodiment of the present application. Figure 7 As shown, if the theoretical duty cycle is greater than or equal to a set threshold, the switched-in phase branch remains in operation to shorten the phase-cutting time. Therefore, the second duty cycle corresponding to the switched-in phase branch can be set to a second set value. The second set value is a value that enables the switched-in phase branch, for example, it can be set to 1. Simultaneously, the first duty cycle corresponding to the switched-out phase branch can be determined based on the voltage transformer circuit.

[0139] In an embodiment of the present application, the first duty cycle of the phase-out branch during a set switching cycle can be set to different values based on the number of switching cycles within the phase-out cycle. Specifically, a second number of switching cycles within the phase-out cycle is first determined based on the average inductor current of the multiple phase branches and the current rise slope of the phase-in branch. The second number of switching cycles refers to the number of switching cycles of the phase-out branch during the phase-out cycle, and the second number of switching cycles includes at least one set switching cycle. The first duty cycle is then determined based on a comparison of the number of switching cycles of the set switching cycle within the phase-out cycle with the second number of switching cycles.

[0140] Because the phase-cut points within a phase-cut cycle have different cut-in times during the first set switching cycle, in one example, a comparison result of the number of switching cycles within the phase-cut cycle and the second number of switching cycles may include: the number of switching cycles being less than the second number of switching cycles, and the number of switching cycles being equal to the second number of switching cycles. When the number of switching cycles is equal to the first number of switching cycles, the last switching cycle may not be a complete cycle, and therefore the switching device controlling the phase-cut-out branch is in the off state.

[0141] Specifically, a constant duty cycle of the voltage conversion circuit is obtained based on a ratio of an output voltage to an input voltage of the voltage conversion circuit. If the number of switching cycles in the phase-cut period is less than the second number of switching cycles, a first duty cycle is determined based on the constant duty cycle. If the number of switching cycles in the phase-cut period is equal to the second number of switching cycles, the first duty cycle is determined as a first set value.

[0142] Specifically, the second switching period is calculated by the following formula (6):

[0143]

[0144] in, Indicates rounding the calculated value to an integer, M2 is the second switching cycle number, is the average inductor current; m1 is the current rising slope; T s To set the switching cycle.

[0145] The first duty cycle is calculated by the following formula (7):

[0146]

[0147] Among them, d shed is the first duty cycle, d is the constant duty cycle, M2 is the second switching cycle number, The number of switching cycles in the phase shedding cycle is set. Formula (7) is also a calculation method based on a large number of experiments that can make the phase shedding control more efficient.

[0148] In the embodiment of the present application, when the timing circuit performs phase shedding control, it can first determine whether the transformer circuit is a steady-state circuit. If the transformer circuit is a steady-state circuit, it can continue to determine whether the transformer circuit requires phase shedding. If the transformer circuit is not a steady-state circuit, it is necessary to reset the timer until the transformer circuit is in a steady state.

[0149] If the transformer circuit is in a light-load condition, indicating that the transformer circuit needs phase shedding, the transformer circuit is controlled based on the calculated phase shedding timing. If the transformer circuit is in a heavy-load condition, indicating that the transformer circuit does not need phase shedding, the transformer circuit does not need phase shedding control, and multiple phase branches can be enabled simultaneously.

[0150] Whether the voltage transformer circuit requires phase shedding can be determined based on the first switching cycle number M1 and the second switching cycle number M2. If the first switching cycle number M1 or the second switching cycle number M2 in the phase shedding cycle is equal to a third set value, it is determined that the voltage transformer circuit does not require phase shedding. If the first switching cycle number M1 or the second switching cycle number M2 in the phase shedding cycle is not equal to the third set value, it is determined that the voltage transformer circuit requires phase shedding.

[0151] In summary, the phase-cutting strategy of the embodiment of the present application can end the transient process in a shorter time while keeping the average value of the output current equal, so that the transformer circuit has better transient performance and smaller output oscillation.

[0152] Figure 8 FIG. 8 is a schematic diagram of a control device 800 for a voltage transformer circuit provided in an embodiment of the present application. Figure 8 As shown, a control device 800 for a voltage transformer circuit may include an acquisition module 801, a determination module 802, and a control module 803. Acquisition module 801 is configured to acquire an output signal from the voltage transformer circuit. Determination module 802 is configured to determine a phase-cutting sequence for each phase branch based on the output signal from the voltage transformer circuit. Control module 803 is configured to perform phase-cutting control on the voltage transformer circuit based on the phase-cutting sequence, so that the target phase branch supplying power to the load switches between multiple phase branches according to the phase-cutting sequence.

[0153] Among them, the acquisition module 801, the determination module 802 and the control module 803 can be used to respectively execute steps 301-303 in the embodiment corresponding to the control method of the above-mentioned transformer circuit. For the specific implementation methods of these modules and more details, please refer to the corresponding method part, which will not be repeated here.

[0154] An embodiment of the present application further provides a vehicle, which may include the above-mentioned voltage conversion circuit and / or the above-mentioned voltage conversion circuit control device 800.

[0155] Figure 9 This is a block diagram of a controller 900 for a voltage conversion circuit provided in an embodiment of the present application. The voltage conversion circuit controller 900 includes a memory 901 and a processor 902. The memory 901 is configured to store instructions. The processor 902 is configured to retrieve instructions from the memory 901 and, when executing the instructions, implement the aforementioned method for controlling the voltage conversion circuit.

[0156] An embodiment of the present application further provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the above-mentioned control method for the voltage conversion circuit.

[0157] Since the instructions stored in the controller and the machine-readable storage medium can execute the steps in any of the control methods for the transformer circuit provided in the embodiments of the present application, the beneficial effects that can be achieved by any of the control methods for the transformer circuit provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0158] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0159] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0160] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0161] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0162] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0163] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0164] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media such as modulated communication signals and carrier waves.

[0165] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0166] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for controlling a voltage transformer circuit, characterized in that: The voltage conversion circuit includes a plurality of phase branches connected to a load and supplying power to the load, and the control method includes: obtaining an output signal of the voltage conversion circuit; determining a phase-cutting timing of each phase branch based on an output signal of the voltage transformation circuit; The voltage conversion circuit is subjected to phase-cutting control based on the phase-cutting timing sequence, so that the target phase branch supplying power to the load is switched among the multiple phase branches according to the phase-cutting timing sequence.

2. The control method according to claim 1, characterized in that: The obtaining of the output signal of the voltage conversion circuit includes: Obtaining the output voltage of the voltage conversion circuit; A proportional-integral-derivative control is performed based on the output voltage to obtain a control voltage.

3. The control method according to claim 2, characterized in that: The determining of the phase-cutting timing of each phase branch based on the output signal of the voltage transformation circuit includes: Obtaining an output current of the voltage conversion circuit; Determine a plurality of phase-cutting periods according to the plurality of phase branches, wherein the phase-cutting period is a time period from switching from a cut-out phase branch to a cut-in phase branch; Determining a theoretical duty cycle of the switched-in phase branch in a set switching period in each phase-cutting period according to the control voltage and the output current; Determining a control mode for each phase-cutting period based on a comparison result between the theoretical duty cycle and a set threshold; In which, the control method includes controlling a first duty cycle corresponding to the cut-out phase branch and a second duty cycle corresponding to the cut-in phase branch, wherein the first duty cycle is the proportion of the conduction time of the cut-out phase branch within the set switching cycle, and the second duty cycle is the proportion of the conduction time of the cut-in phase branch within the set switching cycle.

4. The control method according to claim 3, characterized in that: The determining of the control mode of each phase cutting period based on the comparison result between the theoretical duty cycle and the set threshold value includes: If the theoretical duty cycle is less than the set threshold, the first duty cycle of the switched-out phase branch in the set switching period is set to a first set value, and the second duty cycle of the switched-in phase branch in the set switching period is determined based on the voltage conversion circuit.

5. The control method according to claim 4, characterized in that: The determining, based on the voltage transformation circuit, a second duty cycle of the switched-in phase branch in the set switching period includes: Determining a first number of switching cycles within the phase-cut cycle according to an average inductor current of a plurality of the phase branches and a current falling slope of the switched-in phase branch, wherein the first number of switching cycles includes at least one set switching cycle; The second duty cycle is determined based on a comparison result of the number of switching cycles of the set switching cycle within the phase-cut period and the first number of switching cycles.

6. The control method according to claim 5, characterized in that: The determining the second duty cycle based on a comparison result of the number of switching cycles of the set switching cycle within the phase-cut period and the first number of switching cycles includes: Obtaining a constant duty cycle of the voltage conversion circuit according to a ratio of an output voltage to an input voltage of the voltage conversion circuit; If the number of switching cycles of the set switching cycle within the phase-cut cycle is less than the first number of switching cycles, determining the second duty cycle according to the constant duty cycle; If the number of switching cycles of the set switching cycle in the phase-cut cycle is equal to the first number of switching cycles, the second duty cycle is determined according to the constant duty cycle and the first number of switching cycles.

7. The control method according to claim 6, characterized in that: The first switching cycle number is calculated by the following formula: Wherein, M1 is the first switching cycle number, is the average inductor current; m2 is the current falling slope; T s Setting a switching cycle; The second duty cycle is calculated by the following formula: Among them, d add is the second duty cycle, d is the constant duty cycle, M1 is the first switching cycle number, The number of cycles of the set switching cycle in the phase cutting cycle.

8. The control method according to claim 3, characterized in that: The determining of the control mode of each phase cutting period based on the comparison result between the theoretical duty cycle and the set threshold value includes: If the theoretical duty cycle is greater than or equal to the set threshold, the second duty cycle corresponding to the switched-in phase branch is set to a second set value, and the first duty cycle corresponding to the switched-out phase branch is determined based on the voltage transformation circuit.

9. The control method according to claim 8, characterized in that: The determining, based on the voltage transformation circuit, a first duty cycle corresponding to the switched-out phase branch, includes: Determining a second number of switching cycles within the phase-cut cycle according to an average inductor current of a plurality of the phase branches and a current rising slope of the switched-in phase branch, wherein the second number of switching cycles includes at least one set switching cycle; The first duty cycle is determined based on a comparison result of the number of switching cycles of the set switching cycle within the phase-cut period and the second number of switching cycles.

10. The control method according to claim 9, characterized in that: The determining the first duty cycle based on a comparison result of the number of switching cycles of the set switching cycle within the phase-cut period and the second number of switching cycles includes: Obtaining a constant duty cycle of the voltage conversion circuit according to a ratio of an output voltage to an input voltage of the voltage conversion circuit; If the number of cycles of the set switching cycle within the phase cutting period is less than the second number of switching cycles, determining the first duty cycle according to the constant duty cycle; If the number of the set switching period within the phase-cut period is equal to the second switching period, the first duty cycle is determined as a first set value.

11. The control method according to claim 10, characterized in that: The second switching period is calculated by the following formula: Wherein, M2 is the second switching cycle number, is the average inductor current; m1 is the current rising slope; T s Setting a switching cycle; The first duty cycle is calculated by the following formula: Among them, d shed is the first duty cycle, d is the constant duty cycle, M2 is the second switching cycle number, The number of cycles of the set switching cycle in the phase cutting cycle.

12. The control method according to claim 3, characterized in that: The determining, according to the control voltage and the output current, a theoretical duty cycle of the switched-in phase branch in a set switching period in each phase-cutting period includes: Obtaining an average load current in the transformer circuit; determining a load current compensation value for each of the phase branches based on the average load current; The theoretical duty cycle of the switched-in phase branch in the set switching period in each phase-cutting period is determined according to the load current compensation value, the control voltage and the constant duty cycle of the voltage conversion circuit.

13. The control method according to claim 12, characterized in that: The determining of the load current compensation value of each phase branch based on the average load current includes: The load current compensation value is determined based on a difference between an average load current of the phase leg and an inductor current.

14. The control method according to claim 12, characterized in that: The theoretical duty cycle is calculated using the following formula: Among them, d k is the theoretical duty cycle of the k-phase branch in the set switching period, v con is the control voltage, i os / Ni Lk is the load current compensation value of the k-phase branch, i os is the average load current, N is the number of phase branches, i Lk is the inductor current of the k-phase branch, d is the constant duty cycle, and k-phase is the cut-in phase.

15. The control method according to claim 12, characterized in that: The step of determining a theoretical duty cycle of the switched-in phase branch in a set switching period in each phase-cutting period according to the control voltage and the output current further includes: In response to a load change in the voltage conversion circuit, determining a load current compensation value after the load change; Based on the load current compensation value after the load changes, the theoretical duty cycle of the switched-in phase branch in the set switching period is adjusted.

16. The control method according to any one of claims 1 to 15, characterized in that: The performing phase-cutting control on the voltage conversion circuit based on the phase-cutting timing sequence includes: determining whether the voltage conversion circuit is a steady-state circuit; If the voltage conversion circuit is the steady-state circuit, determining whether the voltage conversion circuit needs phase cutting; If the voltage conversion circuit needs to be phase-cut, the voltage conversion circuit is controlled to be phase-cut based on the phase-cut timing.

17. The control method according to claim 16, characterized in that: The determining whether the transformer circuit needs phase shedding includes: If the number of first switching cycles or the number of second switching cycles in the phase cutting cycle is a third set value, it is determined that the voltage conversion circuit does not need phase cutting; If the number of the first switching cycles or the second switching cycles in the phase cutting cycle is not a third set value, it is determined that the voltage conversion circuit needs to be phase cut.

18. A voltage conversion circuit, characterized in that: The voltage conversion circuit is applied to a method for controlling a voltage conversion circuit according to any one of claims 1 to 17.

19. A control device for a voltage transformer circuit, characterized in that: The voltage conversion circuit includes a plurality of phase branches connected to a load and supplying power to the load, and the control device includes: An acquisition module, configured to acquire an output signal of the voltage conversion circuit; a determination module, configured to determine a phase-cutting timing of each phase branch based on an output signal of the voltage conversion circuit; A control module is configured to perform phase-cutting control on the voltage conversion circuit based on the phase-cutting sequence, so that a target phase branch supplying power to the load is switched among the multiple phase branches according to the phase-cutting sequence.

20. A vehicle, characterized in that: include: The voltage conversion circuit according to claim 18; and / or The control device for the voltage conversion circuit according to claim 19.

21. A controller for a voltage conversion circuit, characterized in that: include: a memory configured to store instructions; as well as A processor is configured to call the instructions from the memory and implement the control method of the voltage conversion circuit according to any one of claims 1 to 17 when executing the instructions.

22. A machine-readable storage medium, characterized in that The machine-readable storage medium stores instructions, which, when executed by a processor, enable the processor to be configured to execute the method for controlling a voltage conversion circuit according to any one of claims 1 to 17.

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