CN112564482B

CN112564482B - Four-switch-tube buck-boost converter control method and device, controller and storage medium

Info

Publication number: CN112564482B
Application number: CN202011462075.3A
Authority: CN
Inventors: 李田田; 王利强; 范杨平; 吕剑; 陈敬庚; 郭立科; 江威; 刘亚飞
Original assignee: Xi'an Telai Intelligent Charging Technology Co ltd
Current assignee: Xi'an Telai Intelligent Charging Technology Co ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2022-05-20
Anticipated expiration: 2040-12-08
Also published as: CN112564482A

Abstract

The application provides a control method, a control device, a controller and a storage medium for a four-switch-tube buck-boost converter, and relates to the technical field of power electronic control. The method comprises the following steps: acquiring a signal sampling value of a target port, wherein the target port comprises at least one of a first port and a second port, and the signal sampling value comprises: a voltage sampling value and a current sampling value; generating a control signal according to a signal sampling value of a target port and a preset signal value of the target port acquired in advance, wherein the preset signal value comprises: presetting a voltage value and a current value; and generating a switching tube driving signal based on the control signal so as to drive the four switching tube buck-boost converter to work. According to the scheme, the real-time switching of energy flow is realized by configuring the preset signal value of the port and adjusting the signal sampling value through the preset signal value, the control method is convenient to operate, rapid and smooth bidirectional switching can be realized, and the energy control efficiency is improved.

Description

Four-switch-tube buck-boost converter control method and device, controller and storage medium

Technical Field

The application relates to the technical field of power electronic control, in particular to a control method, device, controller and storage medium for a four-switch-tube buck-boost converter.

Background

A DC-DC (direct current-direct current) converter is a power electronic application device for converting direct current electric energy into another direct current electric energy, can realize conversion between different direct current voltages, currents and the like, and is widely applied to the fields of renewable energy sources, power systems, industrial control and the like. In general, DC-DC converters are operated unidirectionally. With the development of science and technology, a plurality of application occasions require that direct current energy can flow in two directions, such as a battery charging and discharging system, an electric automobile, an aerospace power supply system, an uninterruptible power supply system and the like, so that a two-way DC-DC converter is derived. The four-switch tube Buck-Boost topology obtained by compounding the Buck converter and the Boost converter has the advantages of simple structure, same input and output polarities, port voltage rise and drop and the like, and is suitable for occasions with wider voltage change range.

In the prior art, when a four-switch tube Buck-Boost converter works in a bidirectional mode, single-switch control is usually adopted, and only one switch tube acts at the same time.

However, the inductor current is discontinuous and the overshoot is large, and only the step-up or step-down function can be realized in one direction, thereby resulting in low control efficiency.

Disclosure of Invention

An object of the present application is to provide a four-switch-tube buck-boost converter control method, device, controller and storage medium, so as to solve the problem of low control efficiency of a bidirectional converter in the prior art.

In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:

in a first aspect, an embodiment of the present application provides a four-switch-tube buck-boost converter control method, which is applied to a four-switch-tube buck-boost converter, where the four-switch-tube buck-boost converter is formed by connecting two four-switch-tube buck-boost circuits in parallel, and the four-switch-tube buck-boost converter includes a first port and a second port, and the first port and the second port are respectively used for connecting a load and a dc bus; the method comprises the following steps:

obtaining a signal sample value of a target port, wherein the target port comprises at least one of the first port and the second port, and the signal sample value comprises: a voltage sampling value and a current sampling value;

generating a control signal according to the signal sampling value of the target port and a preset signal value of the target port acquired in advance, wherein the preset signal value comprises: presetting a voltage value and a current value;

and generating a switching tube driving signal based on the control signal so as to drive the four-switching-tube buck-boost converter to work.

Optionally, the generating a control signal according to the signal sampling value of the target port and a preset signal value of the target port acquired in advance includes:

determining a signal control quantity of the target port according to the signal sampling value of the target port and a preset signal value of the target port acquired in advance, wherein the signal control quantity comprises: a voltage control quantity and a current control quantity;

determining a target value of an inductive current of the four-switch tube buck-boost converter according to the signal control quantity of the target port, wherein the target value of the inductive current comprises: a target value of the first inductor current and a target value of the second inductor current;

determining the control quantity of the inductive current according to the target value of the inductive current and the sampling value of the inductive current;

and generating the control signal according to the control quantity of the inductive current and a preset single carrier.

Optionally, the determining a signal control quantity of the target port according to the signal sampling value of the target port and a preset signal value of the target port acquired in advance includes:

determining a signal deviation amount of the target port according to the signal sampling value of the target port and a preset signal value of the target port;

and determining the signal control quantity of the target port according to the signal deviation quantity of the target port.

Optionally, the direction of the inductor current is a direction from the second port to the first port;

the determining a target value of the inductive current of the four-switch-tube buck-boost converter according to the signal control quantity of the target port comprises:

if the working mode of the buck-boost converter is the unidirectional working mode from the second port to the first port, determining a target value of the inductive current according to the signal control quantity of the first port;

if the working mode of the buck-boost converter is the unidirectional working mode from the first port to the second port, determining a target value of the inductive current according to the signal control quantity of the second port;

and if the working mode of the buck-boost converter is the bidirectional working mode of the first port and the second port, determining a target value of the inductive current according to the signal control quantity of the first port and the signal control quantity of the second port.

Optionally, the determining a target value of the inductor current according to the signal control quantity of the first port includes:

comparing the voltage control quantity and the current control quantity of the first port;

and determining the minimum value of the voltage control quantity and the current control quantity of the first port as the target value of the first inductor current and the target value of the second inductor current.

Optionally, the determining a target value of the inductor current according to the signal control quantity of the second port includes:

comparing the voltage control quantity and the current control quantity of the second port;

and determining the maximum value of the voltage control quantity and the current control quantity of the second port as the target value of the first inductor current and the target value of the second inductor current.

Optionally, the determining a target value of the inductor current according to the signal controlled variable of the first port and the signal controlled variable of the second port includes:

determining the minimum value of the voltage control quantity and the current control quantity of the first port as a first control quantity;

determining the maximum value of the voltage control quantity and the current control quantity of the second port as a second control quantity;

and setting the minimum value of the first control quantity and the second control quantity as the target value of the first inductance current and the target value of the second inductance current.

Optionally, the determining the control amount of the inductor current according to the target value of the inductor current and the sampled value of the inductor current includes:

determining a deviation amount of the first inductive current according to the target value of the first inductive current and the sampling value of the first inductive current;

determining a control quantity of the first inductive current according to the deviation quantity of the first inductive current;

determining the deviation amount of the second inductive current according to the target value of the second inductive current and the sampling value of the second inductive current;

and determining the control quantity of the second inductive current according to the deviation quantity of the second inductive current.

Optionally, before generating a control signal according to the signal sampling value of the target port and the pre-acquired preset signal value of the target port, the method further includes:

determining the working mode of the buck-boost converter according to the received control instruction of the user;

and determining a preset signal value of the target port according to the working mode of the buck-boost converter.

In a second aspect, an embodiment of the present application further provides a four-switch-tube buck-boost converter control device, which is applied to a four-switch-tube buck-boost converter, where the four-switch-tube buck-boost converter is formed by connecting two four-switch-tube buck-boost circuits in parallel, and the four-switch-tube buck-boost converter includes a first port and a second port, and the first port and the second port are respectively used for connecting a load and a dc bus; the device comprises: the device comprises an acquisition module, a generation module and a driving module;

the obtaining module is configured to obtain a signal sample value of a target port, where the target port includes at least one of the first port and the second port, and the signal sample value includes: a voltage sampling value and a current sampling value;

the generating module generates a control signal according to the signal sampling value of the target port and a preset signal value of the target port, wherein the preset signal value includes: presetting a voltage value and a current value;

and the driving module is used for generating a switching tube driving signal based on the control signal so as to drive the four switching tube buck-boost converter to work.

Optionally, the generating module is specifically configured to determine a signal control quantity of the target port according to the signal sampling value of the target port and a preset signal value of the target port acquired in advance, where the signal control quantity includes: a voltage control quantity and a current control quantity; determining a target value of an inductive current of the four-switch tube buck-boost converter according to the signal control quantity of the target port, wherein the target value of the inductive current comprises: a target value of the first inductor current and a target value of the second inductor current; determining the control quantity of the inductive current according to the target value of the inductive current and the sampling value of the inductive current; and generating the control signal according to the control quantity of the inductive current and a preset single carrier.

Optionally, the generating module is specifically configured to determine a signal deviation amount of the target port according to the signal sampling value of the target port and a preset signal value of the target port; and determining the signal control quantity of the target port according to the signal deviation quantity of the target port.

optionally, the generating module is specifically configured to determine a target value of the inductor current according to a signal control quantity of the first port if a working mode of the buck-boost converter is a unidirectional working mode from the second port to the first port; if the working mode of the buck-boost converter is the unidirectional working mode from the first port to the second port, determining a target value of the inductive current according to the signal control quantity of the second port; and if the working mode of the buck-boost converter is the bidirectional working mode of the first port and the second port, determining a target value of the inductive current according to the signal control quantity of the first port and the signal control quantity of the second port.

Optionally, the generating module is specifically configured to compare the voltage control quantity and the current control quantity of the first port; and determining the minimum value of the voltage control quantity and the current control quantity of the first port as the target value of the first inductor current and the target value of the second inductor current.

Optionally, the generating module is specifically configured to compare the voltage control quantity and the current control quantity of the second port; and determining the maximum value of the voltage control quantity and the current control quantity of the second port as the target value of the first inductor current and the target value of the second inductor current.

Optionally, the generating module is specifically configured to determine that a minimum value of the voltage controlled variable and the current controlled variable of the first port is a first controlled variable; determining the maximum value of the voltage control quantity and the current control quantity of the second port as a second control quantity; and setting the minimum value of the first control quantity and the second control quantity as the target value of the first inductance current and the target value of the second inductance current.

Optionally, the generating module is specifically configured to determine a deviation amount of the first inductor current according to the target value of the first inductor current and the sampling value of the first inductor current; determining a control quantity of the first inductive current according to the deviation quantity of the first inductive current; determining the deviation amount of the second inductive current according to the target value of the second inductive current and the sampling value of the second inductive current; and determining the control quantity of the second inductive current according to the deviation quantity of the second inductive current.

Optionally, the apparatus further comprises: a determination module;

the determining module is used for determining the working mode of the buck-boost converter according to the received control instruction of the user; and determining a preset signal value of the target port according to the working mode of the buck-boost converter.

In a third aspect, an embodiment of the present application provides a controller, including: the four-switch-tube buck-boost converter control method comprises a processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, when the controller runs, the processor and the storage medium are communicated through the bus, and the processor executes the machine-readable instructions to execute the steps of the four-switch-tube buck-boost converter control method provided in the first aspect.

In a fourth aspect, the present application provides a storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for controlling a four-switch-tube buck-boost converter according to the first aspect is performed.

The beneficial effect of this application is:

the application provides a four-switch tube buck-boost converter control method, a four-switch tube buck-boost converter control device, a four-switch tube buck-boost converter control controller and a storage medium, wherein the method comprises the following steps: acquiring a signal sampling value of a target port, wherein the target port comprises at least one of a first port and a second port, and the signal sampling value comprises: a voltage sampling value and a current sampling value; generating a control signal according to a signal sampling value of a target port and a preset signal value of the target port acquired in advance, wherein the preset signal value comprises: presetting a voltage value and a current value; and generating a switching tube driving signal based on the control signal so as to drive the four switching tube buck-boost converter to work. In the scheme, a control signal can be generated according to a signal sampling value and a preset signal value of the target port by configuring the preset signal value of the target port, so that the switching tube driving signal generated by the control signal controls the on-off of each switching tube S1-S8 in the four-switching tube buck-boost converter, the signal sampling value of the target port follows the preset signal value of the target port until the preset signal value is reached, and the real-time switching of the energy flow of the converter is realized. According to the scheme, the real-time switching of energy flow is realized by configuring the preset signal value of the port and adjusting the signal sampling value through the preset signal value, the control method is convenient to operate, rapid and smooth bidirectional switching can be realized, and the energy control efficiency is improved.

In addition, the two paths of inductive current inner loops are used for average control, the current control loop can be regarded as a new equivalent first-order power level, automatic current regulation is achieved, and when the two paths of boost-buck circuits which are connected in parallel are not equalized, the current equalizing effect can be well achieved through the control method.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

Fig. 1 is a schematic circuit diagram of a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 2 is a schematic flowchart of a control method of a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 3 is a schematic flow chart of another control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 4 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 5 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 6 is a schematic flowchart of another control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 7 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 8 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 9 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 10 is a schematic flow chart of another control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure;

fig. 11 is a schematic diagram of a four-switch-tube buck-boost converter control apparatus according to an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of a controller according to an embodiment of the present application.

Detailed Description

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for illustrative and descriptive purposes only and are not used to limit the scope of protection of the present application. Further, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be performed out of order, and that steps without logical context may be reversed in order or performed concurrently. One skilled in the art, under the guidance of this application, may add one or more other operations to, or remove one or more operations from, the flowchart.

In addition, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the presence of the features stated hereinafter, but does not exclude the addition of further features.

A direct current-direct current (DC-DC) converter is a power electronic application device that converts DC electric energy into another DC electric energy, can realize conversion between different DC voltages, currents, etc., and is widely used in the fields of renewable energy, power systems, industrial control, etc.

In general, DC-DC converters are operated unidirectionally. With the development of science and technology, a plurality of application occasions require that direct current energy can flow in two directions, such as a battery charging and discharging system, an electric automobile, an aerospace power supply system, an uninterruptible power supply system and the like, so that a two-way DC-DC converter is derived. The bidirectional DC-DC converter changes the directions of input and output currents according to actual requirements under the condition that the polarities of voltages at the input end and the output end are not changed, and is a typical one-machine dual-purpose device.

For the bidirectional transmission of power flow, firstly, after two unidirectional DC-DC converters are connected in an anti-parallel way, the bidirectional transmission of the power flow can be realized, but the bidirectional transmission of the power flow has the defects of more components, low power density, poor circuit utilization rate, slower response speed during the switching of the energy direction and the like; and secondly, other additional equipment is added to control the energy bidirectional flow of the unidirectional converter, the method has low reliability and discontinuous energy switching, and the converter needs to be stopped to switch the direction of the equipment. Compared with the method, the bidirectional DC-DC converter can not only improve the power density and has good reliability, but also can more quickly switch the power in two directions, and has the advantages of high efficiency, good dynamic performance and the like.

In a plurality of bidirectional DC-DC topologies, a Buck (Buck) and Boost (Boost) converter are compounded to obtain a double-switch tube Buck-Boost converter, a diode is replaced by a switch device, and the obtained four-switch tube Buck-Boost topology is most widely applied, has the advantages of simple structure, same input and output polarities, port voltage being capable of being boosted and reduced and the like, and is suitable for occasions with wider voltage change range.

In the prior art, when a four-switch tube Buck-Boost converter works in a bidirectional mode, various control schemes exist. Firstly, single-switch control is adopted, only one switching tube acts at the same time, the switching loss is small, but the inductive current is discontinuous and the overshoot is large, and only the boosting or the voltage reducing function can be realized in a single direction; and secondly, four-switch control is adopted, four switching tubes of a left bridge arm and a right bridge arm act simultaneously, the inductive current is continuous, the overshoot is small, the dynamic performance is good, the voltage boosting and reducing functions can be realized in a single direction, and the defects of large switching loss, low efficiency and the like exist.

Based on the problems existing in the prior art, the application provides a control method of a four-switch-tube buck-boost converter, which has the core idea that: the control signal is generated according to the signal sampling value and the preset signal value of the target port by configuring the preset signal value of the target port, so that the on-off of a switching tube of the converter is controlled according to the control signal, the signal sampling value of the target port follows the preset signal value of the target port until the preset signal value is reached, and the rapid and smooth real-time bidirectional switching of energy flow of the converter is realized.

The detailed description of the specific steps and the advantageous effects of the four-switch-tube buck-boost converter control method provided by the present application will be provided by a plurality of specific embodiments as follows.

Fig. 1 is a schematic circuit diagram of a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; fig. 2 is a schematic flowchart of a control method of a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; optionally, the four-switch-tube buck-boost converter control method provided by the application can be applied to a four-switch-tube buck-boost converter.

As shown in fig. 1, the four-switch-tube buck-boost converter may be formed by connecting two four-switch-tube buck-boost circuits in parallel, so as to form a two-way staggered parallel four-switch-tube buck-boost converter structure. The four-switch tube buck-boost circuit comprises a four-switch tube buck-boost circuit composed of switch tubes S1, S2, S3 and S4, an inductor L1 and a capacitor C1, and further comprises another four-switch tube buck-boost circuit composed of S5, S6, S7 and S8, an inductor L2 and a capacitor C2. Alternatively, the switch tubes S1-S8 may be IGBTs (Insulated Gate Bipolar transistors). As shown in fig. 1, the four-switch tube buck-boost converter may include a first port (a-port) and a second port (B-port), and in this embodiment, the first port may be defined as a battery side for connecting a load, for example: connecting various charging devices: electric vehicles, electric automobiles, and the like. Defining a second port as a dc bus side for receiving an input of an external dc grid. The converter can charge a load connected with the first port through direct current input by the second port, and can also charge a direct current bus of the second port through the load connected with the first port, so that bidirectional flow of energy is realized.

Certainly, the first port and the second port may also be defined by replacing according to requirements, and if the port definition needs to be replaced, the size of the amplitude limiting value corresponding to different interfaces in the program needs to be replaced, so as to implement flexible control of the ports.

Optionally, the two-way staggered parallel four-switch-tube buck-boost converter structure is adopted in the application, and the charging and discharging of the inductor of each branch are controlled to be staggered, so that the currents of the two branches are mutually offset to achieve the effect of reducing the current ripple of the combined circuit, and the number of filter capacitors is reduced, so that the power density is effectively improved.

As shown in fig. 2, the method for controlling a four-switch-tube buck-boost converter provided by the present application may include:

s201, obtaining a signal sampling value of a target port, wherein the target port comprises at least one of a first port and a second port, and the signal sampling value comprises: a voltage sample value and a current sample value.

Optionally, the signal sampling values of the target port may be acquired in real time during the operation of the converter, where the signal sampling values include voltage sampling values and current sampling values, and the voltage sampling values and the current sampling values may be continuously increased from 0 along with the continuous operation of the converter.

S202, generating a control signal according to the signal sampling value of the target port and a preset signal value of the target port, wherein the preset signal value comprises: a preset voltage value and a preset current value.

In general, a bidirectional converter can operate in three modes: the method comprises the following steps of a unidirectional working mode from the second port to the first port (charging from the second port to the first port), a unidirectional working mode from the first port to the second port (charging from the first port to the second port), or a bidirectional working mode from the first port to the second port (switching to charging from the first port to the second port in real time in the process of charging from the second port to the first port).

Optionally, for any one of the operating modes, a control signal may be generated according to the signal sampling value of the target port and a pre-acquired preset signal value of the target port, so that the signal sampling value of the target port can follow the preset signal value of the target port until the preset signal value is reached, thereby realizing continuous and stable charging.

And S203, generating a switching tube driving signal based on the control signal so as to drive the four-switching tube buck-boost converter to work.

Optionally, according to the obtained control signal, a switching tube driving signal may be generated, so that on/off of each switching tube in the four-switching tube buck-boost converter may be controlled according to the switching tube driving signal to drive the four-switching tube buck-boost converter to operate in a target mode.

In an implementation manner, an execution main body of the method may be a controller, the controller may be integrated in a processor chip (e.g., a DSP, an FPGA, or the like), or may be an independent controller, the controller may be connected to a driving circuit, the driving circuit may be connected to the four-switch-tube buck-boost converter, and the controller may calculate and generate a control signal according to an input signal sampling value and a preset signal value of the target port, output the control signal to the driving circuit, and generate a switch tube driving signal through the driving circuit, so as to drive the four-switch-tube buck-boost converter to operate according to the switch tube driving signal.

In summary, the method for controlling a four-switch-tube buck-boost converter provided in this embodiment includes: acquiring a signal sampling value of a target port, wherein the target port comprises at least one of a first port and a second port, and the signal sampling value comprises: a voltage sampling value and a current sampling value; generating a control signal according to a signal sampling value of a target port and a preset signal value of the target port acquired in advance, wherein the preset signal value comprises: presetting a voltage value and a current value; and generating a switching tube driving signal based on the control signal so as to drive the four switching tube buck-boost converter to work. In the scheme, a control signal can be generated according to a signal sampling value and a preset signal value of the target port by configuring the preset signal value of the target port, so that the switching tube driving signal generated by the control signal controls the on-off of each switching tube S1-S8 in the four-switching tube buck-boost converter, the signal sampling value of the target port follows the preset signal value of the target port until the preset signal value is reached, and the real-time switching of the energy flow of the converter is realized. According to the scheme, the real-time switching of energy flow is realized by configuring the preset signal value of the port and adjusting the signal sampling value through the preset signal value, the control method is convenient to operate, rapid and smooth bidirectional switching can be realized, and the energy control efficiency is improved.

Fig. 3 is a schematic flow chart of another control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; optionally, as shown in fig. 3, in the step S202, generating the control signal according to the signal sampling value of the target port and the pre-set signal value of the target port acquired in advance may include:

s301, determining a signal control quantity of the target port according to the signal sampling value of the target port and a preset signal value of the target port acquired in advance, wherein the signal control quantity comprises: a voltage control quantity and a current control quantity.

Optionally, the signal controlled variable of the target port may be calculated by using a preset controlled variable algorithm according to the signal sampling value and the preset signal value of the target port.

In some embodiments, the preset signal value of the target port in the present scheme can be obtained according to the requirement of the user. For example: the user wants to charge the electric vehicle, and the charging voltage is 300V and the current is 20A, then, at this time, it can be known that the converter works in the mode that the second port charges the first port, and the preset voltage value of the first port is 300V and the preset current value is 20A, based on this, the preset voltage value and the preset current value can be configured for the four-switch-tube buck-boost converter, and the control signal is generated according to the configured preset voltage value and the configured preset current value, the voltage sampling value and the current sampling value, so that the four-switch-tube buck-boost converter is driven to work in the mode that the second port charges the first port based on the switch tube driving signal generated by the control signal, and the energy flow is realized.

S302, determining a target value of the inductive current of the four-switch-tube buck-boost converter according to the signal control quantity of the target port, wherein the target value of the inductive current comprises: a target value of the first inductor current and a target value of the second inductor current.

Optionally, when the four-switch-tube buck-boost converter operates in different modes, the target value of the inductive current in the four-switch-tube buck-boost converter may be determined according to the signal control quantity of the first port or the second port or the first port and the second port, respectively. The target value of the first inductive current is the same as that of the second inductive current, and the target value is determined according to the signal control quantity of the target port.

And S303, determining the control quantity of the inductive current according to the target value of the inductive current and the sampling value of the inductive current.

Similarly to the calculation of the signal controlled variable, the controlled variable of the inductor current can be calculated by adopting a preset controlled variable algorithm according to the target value of the inductor current and the sampling value of the inductor current, wherein the sampling value of the inductor current can also be acquired in real time in the working process of the converter.

And S304, generating a control signal according to the control quantity of the inductive current and a preset single carrier.

In some embodiments, the duty ratio of the signal may be obtained by the obtained control quantity of the inductor current, so that two PWM (pulse width modulation) signals, that is, the control signal, may be generated by comparing the duty ratio with a triangular wave (single carrier) output by the controller at the set operating frequency Ts of the converter. The two paths of PWM signals generate T/2 phase shift through configuration to form an interlaced structure.

The whole control structure in the application adopts outer ring (port voltage and current double-ring competition) + inner ring (inductance and current ring) double-ring nested control, and can realize quick and smooth real-time bidirectional switching. The dual-ring nested control realizes an optimal control rule by taking two feedback signals of port voltage and inductive current; the voltage outer ring can realize automatic regulation of voltage and limit the maximum current value of the power switch tube by an output value; the current inner ring can realize the automatic adjustment of the current.

Fig. 4 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present application. Alternatively, as shown in fig. 4, in the step S301, determining the signal control quantity of the target port according to the signal sampling value of the target port and the preset signal value of the target port acquired in advance may include:

s401, determining a signal deviation amount of the target port according to the signal sampling value of the target port and a preset signal value of the target port.

Generally, the signal sampling value of the target port gradually increases from 0 until reaching the preset signal value of the target port, rather than directly jumping to the preset signal value, and the signal deviation amount of the target port may be calculated according to the signal sampling value of the target port and the preset signal value of the target port.

Optionally, the signal sampling value of the target port may be subtracted from the preset signal value to obtain the signal deviation amount of the target port.

S402, determining a signal control quantity of the target port according to the signal deviation quantity of the target port.

In this embodiment, the controller may linearly combine the proportion and the integral of the deviation according to the signal deviation amount of the target port to form the signal control amount of the target port. Since the signal control amount of the target port is calculated, the controller may configure corresponding parameters required for the outer loop control to perform the calculation of the outer loop control amount.

Optionally, in this application, the direction of the inductor current is a direction from the second port to the first port; that is, the direction of the inductor current when charging from the second port to the first port may be set to the reference positive direction. Of course, in practical applications, the defined reference direction can also be flexibly adjusted.

Fig. 5 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; as shown in fig. 5, the determining the target value of the inductor current of the four-switch-tube buck-boost converter according to the signal control quantity of the target port in step S302 may include:

s501, if the working mode of the buck-boost converter is a one-way working mode from the second port to the first port, determining a target value of the inductive current according to the signal control quantity of the first port.

Alternatively, when the buck-boost converter operates in the unidirectional operation mode (the unidirectional operation mode from the first port to the second port and the unidirectional operation mode from the second port to the first port), only the signal control quantity of the output end is considered, so as to determine the target value of the inductive current according to the signal control quantity of the output end. When the buck-boost converter works in a bidirectional working mode from the first port to the second port, the target value of the inductive current needs to be determined according to the signal control quantity of the first port and the signal control quantity of the second port.

In some cases, when the one-way operating mode from the second port to the first port is determined according to the user's requirement (the user needs to charge the electric vehicle, etc.), the output end is the first port, and then the target value of the inductive current can be determined according to the signal control quantity of the first port.

And S502, if the working mode of the buck-boost converter is a unidirectional working mode from the first port to the second port, determining a target value of the inductive current according to the signal control quantity of the second port.

In other cases, when the unidirectional operating mode of the buck-boost converter from the first port to the second port is determined according to the requirement of a user (the user charges a direct current bus through the electric vehicle of the user, etc.), the output end is the second port, and then the target value of the inductive current can be determined according to the signal control quantity of the second port.

And S503, if the working mode of the buck-boost converter is a bidirectional working mode of the first port and the second port, determining a target value of the inductive current according to the signal control quantity of the first port and the signal control quantity of the second port.

In some cases, a user needs to charge the electric vehicle according to the user's demand, and when the charging reaches a certain value, in order to ensure the demand of electricity on the bus side, the electric vehicle is switched to charge the direct-current bus through the electric vehicle, so that the bidirectional operating mode of the buck-boost converter working at the first port and the second port can be determined, and the target value of the inductive current can be determined according to the signal control quantity of the first port and the signal control quantity of the second port.

Fig. 6 is a schematic flowchart of another control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; alternatively, as shown in fig. 6, the determining the target value of the inductor current according to the signal control amount of the first port in step S501 may include:

s601, comparing the voltage control quantity and the current control quantity of the first port.

Optionally, the voltage deviation amount of the first port may be obtained through a voltage sampling value and a preset voltage value of the first port, and the voltage control amount is formed by linearly combining the proportion and the integral of the voltage deviation amount according to the voltage deviation amount of the first port.

Similarly, the current deviation amount of the first port can be obtained through the current sampling value of the first port and a preset current value, and the proportion and the integral of the current deviation amount are linearly combined to form the current control amount according to the current deviation amount of the first port.

In this embodiment, in the unidirectional operating mode from the second port to the first port, the direction of the inductive current is the same as the reference positive direction, that is, the control amounts of the voltage loop and the current loop of the first port compete for a small value as the target value of the inductive current.

S602, determining the minimum value of the voltage control quantity and the current control quantity of the first port as the target value of the first inductive current and the target value of the second inductive current.

Alternatively, by making the ratio of the voltage control amount and the current control amount of the first port smaller, the smaller control amount is taken as the target value of the inductor current. As can be seen from fig. 1, the four-switch-tube buck-boost converter of the present application includes a first inductor current and a second inductor current, and then the above ratio is smaller as the target values of the first inductor current and the second inductor current.

Fig. 7 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; alternatively, as shown in fig. 7, the determining the target value of the inductor current according to the signal control amount of the second port in step S502 may include:

s701, comparing the voltage control quantity and the current control quantity of the second port.

Optionally, the voltage deviation amount of the second port may be obtained through a voltage sampling value of the second port and a preset voltage value, and the voltage controlled variable is formed by linearly combining a proportion and an integral of the voltage deviation amount according to the voltage deviation amount of the second port.

Similarly, the current deviation amount of the second port can be obtained through the current sampling value of the second port and a preset current value, and the proportion and the integral of the current deviation amount are linearly combined to form the current control amount according to the current deviation amount of the second port.

In this embodiment, in the unidirectional operating mode from the first port to the second port, the direction of the inductor current is opposite to the reference positive direction, that is, the controlled quantities of the voltage loop and the current loop of the first port compete for being larger as the target value of the inductor current.

S702, determining the maximum value of the voltage control quantity and the current control quantity of the second port as the target value of the first inductive current and the target value of the second inductive current.

Alternatively, by taking the ratio of the voltage control amount and the current control amount of the second port larger, the larger control amount is taken as the target value of the inductor current. Then, the result of the above ratio being larger may be taken as the target values of the first inductor current and the second inductor current.

Fig. 8 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; alternatively, as shown in fig. 8, in the step S503, determining the target value of the inductor current according to the signal controlled variable of the first port and the signal controlled variable of the second port may include:

s801, determining the minimum value of the voltage control quantity and the current control quantity of the first port as a first control quantity.

S802, determining the maximum value of the voltage control quantity and the current control quantity of the second port as a second control quantity.

S803, the minimum value of the first control amount and the second control amount is set as the target value of the first inductor current and the target value of the second inductor current.

Alternatively, the control amount obtained by the comparison in step S602 may be used as the first control amount, and the control amount obtained by the comparison in step S702 may be used as the second control amount. Thus, the smaller control amount of the first control amount and the second control amount can be set as the target value of the first inductor current and the target value of the second inductor current according to the first control amount and the second control amount.

Fig. 9 is a schematic flowchart of a control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; alternatively, as shown in fig. 9, in the step S303, determining the control amount of the inductor current according to the target value of the inductor current and the sampled value of the inductor current may include:

s901, determining the deviation amount of the first inductive current according to the target value of the first inductive current and the sampling value of the first inductive current.

Similar to the calculation of the semaphore for the target port described above. In this embodiment, a subtraction operation may be performed according to the target value of the first inductor current and the sampling value of the first inductor current to obtain the deviation amount of the first inductor current.

And S902, determining a control quantity of the first inductive current according to the deviation quantity of the first inductive current.

And according to the deviation amount of the first inductor current, the proportion and the integral of the deviation amount are combined linearly to form the control amount of the first inductor current. Optionally, since the control quantity of the inductor current inner loop is calculated, the controller may configure relevant parameters required by inner loop control to calculate the control quantity of the inner loop.

It should be noted that the calculation formula for determining the control amount according to the deviation amount is an existing conventional formula, and is only simply applied here.

And S903, determining the deviation amount of the second inductive current according to the target value of the second inductive current and the sampling value of the second inductive current.

Similarly, the deviation of the second inductor current may be obtained by performing a subtraction operation according to the target value of the second inductor current and the sampling value of the second inductor current.

And S904, determining the control quantity of the second inductive current according to the deviation quantity of the second inductive current.

And according to the deviation amount of the second inductor current, the proportion and the integral of the deviation amount are combined linearly to form the control amount of the second inductor current.

The obtained control quantity of the first inductor current and the control quantity of the second inductor current can be used as a first duty ratio and a second duty ratio. The amplitude limit value of the duty ratio is determined by the maximum and minimum values that the inductive current can bear, and the maximum value is assumed to be a, and the minimum value is assumed to be b, that is, the value range of the duty ratio is a-b.

In an implementation mode, two calculated duty ratios (double modulation) can be compared with a triangular wave (single carrier) output by a controller under the set working frequency Ts of the converter to generate two PWM signals according to a single carrier-double modulation control strategy, the two PWM signals generate a phase shift of T/2 through configuration to form an interlaced structure, and the PWM signals generate a switching tube driving signal through a driving circuit to drive the converter to work.

Fig. 10 is a schematic flow chart of another control method for a four-switch-tube buck-boost converter according to an embodiment of the present disclosure; optionally, as shown in fig. 10, before the step S202 generates the control signal according to the signal sampling value of the target port and the pre-set signal value of the target port acquired in advance, the method of the present application may further include:

and S1001, determining the working mode of the buck-boost converter according to the received control instruction of the user.

S1002, determining a preset signal value of the target port according to the working mode of the buck-boost converter.

In this embodiment, the determination of the preset signal value of the target port is described. Optionally, it may be determined whether the buck-boost converter operates in the unidirectional operation mode or the bidirectional operation mode according to a received control instruction of a user. Wherein, the control instruction of the user can comprise: charging requirement, charging signal value and charging and discharging modes. For example: according to a control instruction of a user, the fact that the user needs to charge the electric vehicle is determined, the charging voltage is 200V, the current is 20A, therefore, the one-way working mode that the buck-boost converter works from the second port to the second port can be determined, the preset voltage signal value is 200V, the preset current signal value is 20A, due to the fact that only the signal value of the output port is considered, the preset signal value (200V, 20A) of the first port can be configured for the controller, therefore, calculation can be conducted according to the preset signal value and the signal sampling value of the first port, and a control signal is determined, so that the converter is controlled to work in the one-way working mode from the second port to the second port.

In some cases, when the control instruction of the user includes the charging and discharging manner, for example: when a user needs to charge the battery at a constant voltage of 200V, the voltage control quantity can be directly calculated according to the voltage signal value and the voltage sampling value of the configured first port, and the voltage control quantity is used as the target value of the inductive current to obtain the control signal.

Optionally, the charging mode may include: constant voltage charge and discharge, constant current charge and discharge and constant power charge and discharge can adaptively change the input parameters of the controller according to different charge and discharge modes so as to accurately calculate control signals and realize the operation of any mode of the converter.

In some realizable modes, the two paths of inductor current inner rings are used for average control, the current control ring can be regarded as a new equivalent first-order power level, and automatic current regulation is realized, so that when the two paths of boost-buck circuits which are connected in parallel are not equalized, the current equalizing effect can be well realized through the control method of the scheme.

In summary, the control method of the four-switch-tube buck-boost converter provided by the application includes: acquiring a signal sampling value of a target port, wherein the target port comprises at least one of a first port and a second port, and the signal sampling value comprises: a voltage sampling value and a current sampling value; generating a control signal according to a signal sampling value of a target port and a preset signal value of the target port acquired in advance, wherein the preset signal value comprises: presetting a voltage value and a current value; and generating a switching tube driving signal based on the control signal so as to drive the four switching tube buck-boost converter to work. In the scheme, a control signal can be generated according to a signal sampling value and a preset signal value of the target port by configuring the preset signal value of the target port, so that the switching tube driving signal generated by the control signal controls the on-off of each switching tube S1-S8 in the four-switching tube buck-boost converter, the signal sampling value of the target port follows the preset signal value of the target port until the preset signal value is reached, and the real-time switching of the energy flow of the converter is realized. According to the scheme, the real-time switching of energy flow is realized by configuring the preset signal value of the port and adjusting the signal sampling value through the preset signal value, the control method is convenient to operate, rapid and smooth bidirectional switching can be realized, and the energy control efficiency is improved.

The following describes a device, an apparatus, and a storage medium for executing the control method of the four-switch-tube buck-boost converter provided by the present application, and specific implementation processes and technical effects thereof are referred to above, and are not described again below.

Fig. 11 is a schematic diagram of a four-switch-tube buck-boost converter control device according to an embodiment of the present application, where functions implemented by the four-switch-tube buck-boost converter control device correspond to steps executed by the foregoing method. The four-switch-tube buck-boost converter control device is applied to a four-switch-tube buck-boost converter, the four-switch-tube buck-boost converter is formed by connecting two four-switch-tube buck-boost circuits in parallel, the four-switch-tube buck-boost converter comprises a first port and a second port, and the first port and the second port are respectively used for connecting a load and a direct-current bus; as shown in fig. 11, the apparatus may include: an acquisition module 110, a generation module 120, and a driving module 130;

an obtaining module 110, configured to obtain a signal sample value of a target port, where the target port includes at least one of a first port and a second port, and the signal sample value includes: a voltage sampling value and a current sampling value;

the generating module 120 generates a control signal according to the signal sampling value of the target port and a pre-acquired preset signal value of the target port, where the preset signal value includes: presetting a voltage value and a current value;

and the driving module 130 is configured to generate a switching tube driving signal based on the control signal, so as to drive the four-switching tube buck-boost converter to operate.

Optionally, the generating module 120 is specifically configured to determine a signal control quantity of the target port according to the signal sampling value of the target port and a preset signal value of the target port acquired in advance, where the signal control quantity includes: a voltage control quantity and a current control quantity; determining a target value of an inductive current of the four-switch tube buck-boost converter according to the signal control quantity of the target port, wherein the target value of the inductive current comprises: a target value of the first inductor current and a target value of the second inductor current; determining the control quantity of the inductive current according to the target value of the inductive current and the sampling value of the inductive current; and generating a control signal according to the control quantity of the inductive current and a preset single carrier.

Optionally, the generating module 120 is specifically configured to determine a signal deviation amount of the target port according to the signal sampling value of the target port and a preset signal value of the target port; and determining the signal control quantity of the target port according to the signal deviation quantity of the target port.

optionally, the generating module 120 is specifically configured to determine the target value of the inductor current according to the signal control quantity of the first port if the working mode of the buck-boost converter is the unidirectional working mode from the second port to the first port; if the working mode of the buck-boost converter is a unidirectional working mode from the first port to the second port, determining a target value of the inductive current according to the signal control quantity of the second port; and if the working mode of the buck-boost converter is a bidirectional working mode of the first port and the second port, determining a target value of the inductive current according to the signal control quantity of the first port and the signal control quantity of the second port.

Optionally, the generating module 120 is specifically configured to compare the voltage control quantity and the current control quantity of the first port; and determining the minimum value of the voltage control quantity and the current control quantity of the first port as a target value of the first inductor current and a target value of the second inductor current.

Optionally, the generating module 120 is specifically configured to compare the voltage control quantity and the current control quantity of the second port; and determining the maximum value of the voltage control quantity and the current control quantity of the second port as the target value of the first inductor current and the target value of the second inductor current.

Optionally, the generating module 120 is specifically configured to determine that a minimum value of the voltage control quantity and the current control quantity of the first port is a first control quantity; determining the maximum value of the voltage control quantity and the current control quantity of the second port as a second control quantity; and taking the minimum value of the first control quantity and the second control quantity as the target value of the first inductance current and the target value of the second inductance current.

Optionally, the generating module 120 is specifically configured to determine a deviation amount of the first inductor current according to a target value of the first inductor current and a sampling value of the first inductor current; determining a control quantity of the first inductive current according to the deviation quantity of the first inductive current; determining the deviation amount of the second inductive current according to the target value of the second inductive current and the sampling value of the second inductive current; and determining the control quantity of the second inductor current according to the deviation quantity of the second inductor current.

Optionally, the apparatus further comprises: a determining module;

The above-mentioned apparatus is used for executing the method provided by the foregoing embodiment, and the implementation principle and technical effect are similar, which are not described herein again.

The above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

The modules may be connected or in communication with each other via a wired or wireless connection. The wired connection may include a metal cable, an optical cable, a hybrid cable, etc., or any combination thereof. The wireless connection may comprise a connection over a LAN, WAN, bluetooth, ZigBee, NFC, or the like, or any combination thereof. Two or more modules may be combined into a single module, and any one module may be divided into two or more units. It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system and the apparatus described above may refer to corresponding processes in the method embodiments, and are not described in detail in this application.

It should be noted that the above modules may be one or more integrated circuits configured to implement the above methods, for example: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, the modules may be integrated together and implemented in the form of a System-on-a-chip (SOC).

Fig. 12 is a schematic structural diagram of a controller according to an embodiment of the present disclosure, where the controller may be integrated in a processing chip.

The controller may include: a processor 801 and a memory 802.

The memory 802 is used for storing programs, and the processor 801 calls the programs stored in the memory 802 to execute the above-mentioned method embodiments. The specific implementation and technical effects are similar, and are not described herein again.

Memory 802 has stored therein program code that, when executed by processor 801, causes processor 801 to perform the various steps of the four switch-tube buck-boost converter control method according to various exemplary embodiments of the present application described in the "exemplary methods" section above in this specification.

The Processor 801 may be a general-purpose Processor, such as a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware components, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present Application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.

Memory 802, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The Memory may include at least one type of storage medium, and may include, for example, a flash Memory, a hard disk, a multimedia card, a card-type Memory, a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a Programmable Read Only Memory (PROM), a Read Only Memory (ROM), a charged Erasable Programmable Read Only Memory (EEPROM), a magnetic Memory, a magnetic disk, an optical disk, and so on. The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory 802 in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.

Optionally, the present application also provides a program product, for example a computer-readable storage medium, comprising a program which, when being executed by a processor, is adapted to carry out the above-mentioned method embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer-readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

Claims

1. The four-switch-tube buck-boost converter control method is characterized by being applied to a four-switch-tube buck-boost converter, wherein the four-switch-tube buck-boost converter is formed by connecting two four-switch-tube buck-boost circuits in parallel, and comprises a first port and a second port, and the first port and the second port are respectively used for connecting a load and a direct-current bus; the method comprises the following steps:

generating a switching tube driving signal based on the control signal so as to drive the four-switching tube buck-boost converter to work;

generating a control signal according to the signal sampling value of the target port and a pre-acquired preset signal value of the target port, including:

the direction of the inductor current is from the second port to the first port;

if the working mode of the buck-boost converter is a bidirectional working mode of the first port and the second port, determining a target value of the inductive current according to the signal control quantity of the first port and the signal control quantity of the second port;

the determining a target value of the inductor current according to the signal control quantity of the first port and the signal control quantity of the second port includes:

2. The method of claim 1, wherein generating a control signal according to the signal sampling value of the target port and a pre-obtained preset signal value of the target port further comprises:

3. The method of claim 2, wherein the determining the signal control quantity of the target port according to the signal sampling value of the target port and the pre-set signal value of the target port acquired in advance comprises:

4. The method of claim 2, wherein the direction of the inductor current is from the second port to the first port;

the determining a target value of the inductive current of the four-switch-tube buck-boost converter according to the signal control quantity of the target port further includes:

if the working mode of the buck-boost converter is a unidirectional working mode from the second port to the first port, determining a target value of the inductive current according to the signal control quantity of the first port;

and if the working mode of the buck-boost converter is the unidirectional working mode from the first port to the second port, determining a target value of the inductive current according to the signal control quantity of the second port.

5. The method of claim 4, wherein determining the target value of the inductor current according to the signal control quantity of the first port comprises:

6. The method of claim 4, wherein determining the target value of the inductor current according to the signal control quantity of the second port comprises:

7. The method according to any one of claims 2-6, wherein determining the controlled variable of the inductor current based on the target value of the inductor current and the sampled value of the inductor current comprises:

determining the deviation amount of the first inductive current according to the target value of the first inductive current and the sampling value of the first inductive current;

8. The method of claim 1, wherein before generating the control signal according to the signal sampling value of the target port and the pre-obtained preset signal value of the target port, the method further comprises:

9. The four-switch-tube buck-boost converter control device is applied to a four-switch-tube buck-boost converter, the four-switch-tube buck-boost converter is formed by connecting two four-switch-tube buck-boost circuits in parallel, the four-switch-tube buck-boost converter comprises a first port and a second port, and the first port and the second port are respectively used for connecting a load and a direct-current bus; the device comprises: the device comprises an acquisition module, a generation module and a driving module;

the driving module is used for generating a switching tube driving signal based on the control signal so as to drive the four switching tube buck-boost converter to work;

the generating module is configured to determine a signal control quantity of the target port according to the signal sampling value of the target port and a preset signal value of the target port acquired in advance, where the signal control quantity includes: a voltage control quantity and a current control quantity; determining a target value of an inductive current of the four-switch tube buck-boost converter according to the signal control quantity of the target port, wherein the target value of the inductive current comprises: a target value of the first inductor current and a target value of the second inductor current;

the generating module is configured to determine a target value of an inductive current according to a signal control quantity of the first port and a signal control quantity of the second port if a working mode of the buck-boost converter is a bidirectional working mode of the first port and the second port;

the generating module is configured to determine a target value of the inductor current according to the signal controlled variable of the first port and the signal controlled variable of the second port, and includes:

10. A controller, comprising: a processor, a storage medium and a bus, wherein the storage medium stores program instructions executable by the processor, when the controller is operated, the processor and the storage medium communicate through the bus, and the processor executes the program instructions to execute the steps of the four-switch tube buck-boost converter control method according to any one of claims 1 to 8.

11. A computer-readable storage medium, having stored thereon a computer program for performing, when executed by a processor, the steps of a four-switch-tube buck-boost converter control method according to any one of claims 1 to 8.