CN115208205A - Control method, device, controller and storage medium for bidirectional converter - Google Patents

Abstract

The invention provides a control method and device of a bidirectional converter, a controller and a storage medium. The bidirectional DC/DC converter is applied to the bidirectional DC/DC converter, and the bidirectional DC/DC converter comprises a primary side converter module and a secondary side converter module; the primary side current transformation module is a full-bridge current transformation module; the secondary side current modules include a first set of switches and a second set of switches in different legs. The method comprises the following steps: when the DC/DC converter is in a forward operation mode or a reverse operation mode: and controlling the switching tubes of the upper bridge arm and the lower bridge arm in the primary side current transformation module to work complementarily, determining the working modes of the first group of switches and the second group of switches according to the switching states of the diagonal switching tubes in the primary side current transformation module, and controlling the first group of switches and the second group of switches to work complementarily according to the working modes. The invention can improve the working reliability of the bidirectional converter.

Description

Control method, device, controller and storage medium for bidirectional converter

technical field

The present invention relates to the technical field of converters, and in particular, to a control method, device, controller and storage medium of a bidirectional converter.

Background technique

With the continuous development of new energy sources, bidirectional converters play an important role as an energy exchanger. Among them, the bidirectional DC/DC converter has the advantages of low power consumption and high efficiency, and has a wide range of application scenarios.

In the prior art, when a bidirectional DC/DC converter is applied, generally when the energy flow of the converter is changed, it is necessary to stop and switch the wave generating mode, and then restart the converter to work. For example, when the converter needs to be converted from the forward working mode to the reverse working mode, it is necessary to control the converter to stop first, switch from the forward PWM (Pulse Width Modulation) wave to the reverse PWM wave, and then control the reverse PWM wave. converter so that the converter can work in reverse.

However, in the prior art, when the converter switches the working mode, it needs to restart and switch the wave generating mode, which is complicated in control and prone to errors.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a control method, device, controller and storage medium for a bidirectional converter, so as to solve the problem that in the prior art, when the converter switches the working mode, it needs to restart and switch the wave-emitting mode, which is cumbersome to control and easy to make mistakes. question.

In a first aspect, the present invention provides a control method for a bidirectional converter, which is applied to a bidirectional DC/DC converter. The bidirectional DC/DC converter includes a primary side converter module and a secondary side converter module; the primary side converter module is a full-bridge converter module; the secondary side converter module includes a first group of switches and a second group of switches on different bridge arms; the method includes:

When the DC/DC converter is in forward working mode or reverse working mode: control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module to complement each other; according to the diagonal angle in the primary side converter module The switch state of the switch tube determines the operating mode of the first group of switches and the second group of switches, and controls the first group of switches and the second group of switches to work complementarily according to the operating mode; wherein, the diagonal switch tubes in the primary side converter module The switch states are the same, and the switch states include on-state or off-state.

In a possible implementation manner, the upper bridge arm in the primary side converter module includes a first switch transistor and a second switch transistor, and the lower bridge arm in the primary side converter module includes a third switch transistor and a fourth switch transistor ; The first switch tube and the second switch tube are both connected to the positive pole of the primary side of the bidirectional DC/DC converter, and the third switch tube and the fourth switch tube are both connected to the negative pole of the primary side of the bidirectional DC/DC converter; the first switch The tube and the fourth switch tube are diagonal switch tubes, and the second switch tube and the third switch tube are diagonal switch tubes;

Control the complementary operation of the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module, including:

The first switch tube and the third switch tube are controlled to work complementary, and the second switch tube and the fourth switch tube are controlled to work complementary; wherein, the switching states of the first switch tube and the fourth switch tube are the same, and the second switch tube and the fourth switch tube are in the same state. The switching states of the three switches are the same.

In a possible implementation manner, controlling the first switch tube and the third switch tube to work complementary, and controlling the second switch tube and the fourth switch tube to work complementary, includes:

When the first switch tube is controlled to be in an off state and the third switch tube is controlled to be in an on state, the second switch tube is controlled to be in an on state, and the fourth switch tube is controlled to be in an off state;

When the first switch tube is controlled to be in an on state and the third switch tube is controlled to be in an off state, the second switch tube is controlled to be in an off state, and the fourth switch tube is controlled to be in an on state.

In a possible implementation manner, the transformer module in the bidirectional DC/DC converter is a first transformer; the first group of switches includes a fifth switch tube, and the second group of switches includes a sixth switch tube;

The first transformer, the primary side is connected to the primary side converter module, the first side of the secondary side is connected to the negative side of the secondary side of the DC/DC converter through the five switch tubes, the common terminal is connected to the positive side of the secondary side of the DC/DC converter, and the secondary side is connected to the negative side of the DC/DC converter. The second end of the side is connected to the negative pole of the secondary side of the DC/DC converter through the sixth switch tube;

Determining the working modes of the first group of switches and the second group of switches according to the switch states of the diagonal switch tubes in the primary-side converter module includes: performing phase-OR of the switch state of the second switch tube and the switch state of the third switch tube. operation, take the obtained result as the working mode of the fifth switch tube; perform a phase OR operation on the switching state of the first switch tube and the switch state of the fourth switch tube, and take the obtained result as the working mode of the sixth switch tube; or ,

Perform an OR operation on the switch state of the second switch tube and the switch state of the third switch tube, perform a NOT operation on the result obtained, and use the non-operation result as the working mode of the fifth switch tube; Perform an OR operation on the switch state of the fourth switch tube and the switch state of the fourth switch tube, perform a non-operation on the obtained result, and use the non-operation result as the working mode of the sixth switch tube; or,

Perform a NAND operation on the switch state of the second switch tube and the switch state of the third switch tube, perform a non-operation on the obtained result, and use the result after the non-operation as the working mode of the fifth switch tube; The switch state of the fourth switch tube is NANDed with the switch state of the fourth switch tube, and the result obtained is subjected to a negation operation, and the non-operation result is used as the working mode of the sixth switch tube.

In a possible implementation manner, the transformer module in the bidirectional DC/DC converter is a second transformer; the first group of switch tubes includes a seventh switch tube and an eighth switch tube, and the second group of switch tubes includes a ninth switch tube and the tenth switch tube; the seventh switch tube and the eighth switch tube constitute the left bridge arm of the secondary side, and the ninth switch tube and the tenth switch tube constitute the right bridge arm of the secondary side;

The second transformer, the primary side is connected to the primary side converter module, the first end of the secondary side is connected to the midpoint of the right bridge arm of the secondary side, and the second end of the secondary side is connected to the midpoint of the left bridge arm of the secondary side; the seventh switch tube and the ninth switch tube are both connected to the output positive pole of the secondary side converter module, and the eighth switch tube and the tenth switch tube are both connected to the output negative pole of the secondary side converter module;

The working modes of the first group of switches and the second group of switches are determined according to the switch states of the diagonal switch tubes in the primary-side converter module, including: ORing the switch state of the second switch tube and the switch state of the third switch tube to NOR operation, take the obtained result as the working mode of the seventh switch; perform an OR operation on the switching state of the first switch and the switch state of the fourth switch, and take the obtained result as the working mode of the eighth switch; or , NAND the switch state of the second switch tube and the switch state of the third switch tube, and use the obtained result as the working mode of the seventh switch tube; compare the switch state of the first switch tube and the switch of the fourth switch tube Perform a NAND operation on the state, and use the obtained result as the working mode of the eighth switch; or, perform an NOR operation on the switching state of the second switch and the switch state of the third switch, and perform a negation on the obtained result, The result after the negation operation is used as the working mode of the seventh switch tube; the switch state of the first switch tube and the switch state of the fourth switch tube are ORed, and the result obtained is subjected to a negation operation, and after the negation The result of the eighth switch is used as the working mode of the eighth switch; or, the switch state of the second switch and the switch state of the third switch are NANDed, the obtained result is not calculated, and the result after the non-operation is used as The working mode of the seventh switch tube; perform a NAND operation on the switch state of the first switch tube and the switch state of the fourth switch tube; Operating mode;

Wherein, the working mode of the ninth switch tube is the same as that of the eighth switch tube, and the working mode of the tenth switch tube is the same as that of the seventh switch tube.

In a possible implementation manner, the bidirectional DC/DC converter includes a resonant inductor, a first transformer, a filter inductor, a secondary side bus capacitor and a controller; the primary side converter module includes a first switch tube, a second switch tube, The third switch tube and the fourth switch tube, the secondary side converter module includes the fifth switch tube and the sixth switch tube, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, and the fifth switch tube and the sixth switch tube are controlled by the controller;

The drain of the first switch tube is respectively connected to the drain of the second switch tube and the positive pole of the primary side of the DC/DC converter, and the source is respectively connected to the drain of the third switch tube and the second end of the primary side of the first transformer ; The second switch tube, the source is respectively connected with the drain of the third switch tube and the first end of the resonant inductor; the third switch tube, the source is connected with the source of the fourth switch tube, the source of the DC/DC converter The side negative pole is connected to the first ground terminal;

the first transformer, the first end of the secondary side is connected to the drain of the fifth switch tube, the second end of the secondary side is connected to the drain of the sixth switch tube, and the common end is connected to the first end of the filter inductor;

Secondary bus capacitor, the first end is respectively connected to the second end of the filter inductor and the positive pole of the secondary side of the DC/DC converter, the second end is respectively connected to the source of the fifth switch, the source of the sixth switch, the The two ground terminals are connected to the positive pole of the secondary side of the DC/DC converter; wherein, the first ground terminal and the second ground terminal are different.

In a possible implementation manner, the bidirectional DC/DC converter includes a resonant inductor, a second transformer, a filter inductor, a secondary bus capacitor and a controller; the primary side converter module includes a first switch tube, a second switch tube, The third switch tube and the fourth switch tube, the secondary side converter module includes the seventh switch tube, the eighth switch tube, the ninth switch tube and the tenth switch tube, the first switch tube, the second switch tube and the third switch tube , the fourth switch tube, the seventh switch tube, the eighth switch tube, the ninth switch tube and the tenth switch tube are all controlled by the controller; the drain of the first switch tube and the drain of the second switch tube and the DC The positive pole of the primary side of the /DC converter is connected, the source is connected to the drain of the third switch tube and the second end of the primary side of the second transformer respectively; the source of the second switch tube is in harmony with the drain of the third switch tube respectively The first end of the vibrating inductor is connected; the third switch tube, the source is connected to the source of the fourth switch tube, the primary negative pole of the DC/DC converter and the first ground terminal respectively;

In the second transformer, the first terminal of the secondary side is connected to the source of the ninth switch tube and the drain of the tenth switch tube respectively, and the second terminal of the secondary side is respectively connected to the source of the seventh switch tube and the drain of the eighth switch tube connect;

the seventh switch tube, the drain of which is respectively connected to the drain of the ninth switch tube and the first end of the filter inductor;

The eighth switch tube, the source is respectively connected to the source of the tenth switch tube, the second end of the secondary side bus capacitor, the secondary side negative pole of the DC/DC converter and the third ground terminal; the first end of the secondary side bus capacitor It is connected with the second end of the filter inductor and the positive pole of the secondary side of the DC/DC converter; wherein, the first ground end and the third ground end are different.

In a second aspect, the present invention provides a control device for a bidirectional converter, which is applied to a bidirectional DC/DC converter. The bidirectional DC/DC converter includes a primary side converter module and a secondary side converter module; the primary side converter module is a full-bridge converter module; the secondary-side converter module includes a first group of switches and a second group of switches on different bridge arms; the device includes:

The control module is used to control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module to complement each other when the DC/DC converter is in the forward working mode or the reverse working mode; The switch states of the diagonal switch tubes in the flow module determine the operating modes of the first group of switches and the second group of switches, and control the first group of switches and the second group of switches to work complementarily according to the operating modes; wherein, in the primary side converter module The switch states of the diagonal switch tubes are the same, and the switch states include an on state or an off state.

In a third aspect, the present invention provides a controller, including a memory and a processor, wherein a computer program that can be run on the processor is stored in the memory, and the processor implements the first aspect or any of the first aspect when the processor executes the computer program. One possible implementation is the steps of a control method of a bidirectional converter.

In a fourth aspect, the present invention provides a converter, comprising the controller of the third aspect and a bidirectional DC/DC converter; the bidirectional DC/DC converter is controlled by the controller.

In a fifth aspect, the present invention provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above first aspect or any possible implementation manner of the first aspect is implemented The steps of a control method of a bidirectional converter.

The present invention provides a control method, device, controller and storage medium for a bidirectional converter, which is applied to a bidirectional DC/DC converter, by controlling the switch tube of the upper bridge arm and the switch of the lower bridge arm in the primary side converter module Complementary work of the tubes; determine the working modes of the first group of switches and the second set of switches according to the switch states of the diagonal switch tubes in the primary side converter module, and control the first and second sets of switches to work complementary according to the working modes. Both forward and reverse operation are controlled by a wave-transmitting mode, and there is no need to restart and switch the wave-transmitting mode of the converter, which reduces the probability of switching errors of the converter, is easy to control, and can improve the working reliability and efficiency of the converter.

Description of drawings

In order to explain the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is an application scenario diagram of a full-bridge DC/DC converter provided by an embodiment of the present invention;

2 is a schematic diagram of a circuit structure of a bidirectional DC/DC converter provided by an embodiment of the present invention;

3 is a schematic diagram of a circuit structure of another bidirectional DC/DC converter provided by an embodiment of the present invention;

4 is a schematic diagram of a circuit structure of still another bidirectional DC/DC converter provided by an embodiment of the present invention;

Fig. 5 is the realization flow chart of the control method of the bidirectional converter provided by the embodiment of the present invention;

6 is a control waveform diagram of a bidirectional DC/DC converter provided by an embodiment of the present invention;

7A to 7C are control waveforms of a bidirectional DC/DC converter in a forward working mode according to an embodiment of the present invention and the measured waveforms of each part;

8A to 8C are the control waveform diagrams of a bidirectional DC/DC converter in the reverse operation mode according to the embodiment of the present invention and the measured waveform diagrams of each part;

9A to 9C are the control waveform diagrams of another bidirectional DC/DC converter under the reverse operation mode according to the embodiment of the present invention and the measured waveform diagrams of each part;

10A to 10B are two NOR waveform diagrams of BUCK provided by an embodiment of the present invention;

11 is another or non-waveform diagram of BUCK provided by an embodiment of the present invention;

12A to 12B are two or non-waveform diagrams of BOOST provided by an embodiment of the present invention;

13 is another or non-waveform diagram of BOOST provided by an embodiment of the present invention;

14 is a schematic structural diagram of a control device for a bidirectional converter provided by an embodiment of the present invention;

FIG. 15 is a schematic diagram of a controller provided by an embodiment of the present invention.

Detailed ways

In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are set forth in order to provide a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the following descriptions will be given through specific embodiments in conjunction with the accompanying drawings.

Referring to 1, it shows an application scenario diagram of the bidirectional DC/DC converter provided by the embodiment of the present invention. As shown in FIG. 1 , the bidirectional DC/DC converter 10 is generally a bidirectional isolation converter, which can be used in a photovoltaic system to share isolation and voltage conversion. For example, when the photovoltaic energy is sufficient (that is, the bus BUS voltage is high), the battery is charged, and at this time, the bidirectional DC/DC converter 10 is in the forward working mode; when the photovoltaic energy is insufficient (that is, the bus BUS voltage is low), the battery is charged to the bus Power is supplied, at this time, the bidirectional DC/DC converter 10 is in the reverse operation mode. It can be considered that the bidirectional DC/DC converter 10 is equivalent to an isolation switch, and the working mode of the DC/DC converter 10 is controlled by an external controller according to the actual situation.

Optionally, in general, a bidirectional DC/DC converter includes a primary-side converter module, a converter module and a secondary-side converter module. The primary-side converter module is generally a full-bridge converter module, and the converter module is used for For isolation conversion, the secondary-side converter module can be a full-bridge converter module or a half-bridge converter module.

The following describes different situations of the secondary-side converter modules respectively: Referring to FIG. 2 , it shows a schematic circuit structure diagram of a bidirectional DC/DC converter provided by an embodiment of the present invention. As shown in Figure 2, the primary-side converter module of the circuit is a full-bridge converter module, and the secondary-side converter module is a half-bridge converter module.

Specifically, the bidirectional DC/DC converter shown in FIG. 2 includes a resonant inductor Lr, a first transformer TX1, a filter inductor Lo, a secondary bus capacitor Co and a controller; the primary side converter module includes a first switch tube Q1, a The second switch transistor Q2, the third switch transistor Q3 and the fourth switch transistor Q4, the secondary side converter module includes the fifth switch transistor Q5 and the sixth switch transistor Q6, the first switch transistor Q1, the second switch transistor, and the third switch transistor Q2. The tube Q3, the fourth switch tube Q4, the fifth switch tube Q5 and the sixth switch tube Q6 are all controlled by the controller;

The drain of the first switch tube Q1 is respectively connected to the drain of the second switch tube Q2 and the positive pole P+ of the primary side of the DC/DC converter, and the source is respectively connected to the drain of the third switch tube Q3 and the source of the first transformer TX1. The second end of the side is connected; the source of the second switch Q2 is respectively connected to the drain of the third switch Q3 and the first end of the resonant inductor Lr; the source of the third switch Q3 is respectively connected to the drain of the third switch Q3. The source, the primary negative pole P- of the DC/DC converter is connected to the first ground terminal G1; the first transformer TX1, the first terminal of the secondary side is connected to the drain of the fifth switch tube Q5, and the second terminal of the secondary side is connected to the first terminal G1. The drain of the six-switch transistor Q6 is connected, and the common terminal is connected to the first terminal of the filter inductor Lo;

Secondary bus capacitor Co, the first end is respectively connected to the second end of the filter inductor Lo and the secondary positive pole S+ of the DC/DC converter, and the second end is respectively connected to the source of the fifth switch Q5 and the sixth switch Q6 The source, the second ground terminal G2 and the secondary side positive pole S+ of the DC/DC converter are connected; wherein, the first ground terminal G1 and the second ground terminal G2 are different.

Optionally, the first transformer may be a three-winding transformer.

Optionally, see FIG. 3 , which shows a schematic circuit structure diagram of another bidirectional DC/DC converter according to an embodiment of the present invention. As shown in FIG. 3 , the bidirectional DC/DC converter may further include an isolation capacitor Cb and a primary bus capacitor Ci. Among them, the isolation capacitor Cb is connected between the resonant inductor Lr and the midpoint of the left bridge arm of the primary side converter module, and the primary side busbar capacitor Ci is connected between the primary side positive electrode P+ and the primary side negative electrode P-. Among them, point A represents the midpoint of the left bridge arm of the primary side converter module, point B represents the midpoint of the right bridge arm of the primary side converter module, C represents the common terminal of the first transformer TX1, and D represents the negative pole of the secondary side, that is, the first The midpoint of the bridge arm of the fifth switch tube and the sixth switch tube.

Referring to FIG. 4 , it shows a schematic circuit structure diagram of still another bidirectional DC/DC converter according to an embodiment of the present invention. As shown in Figure 4, both the primary side converter module and the secondary side converter module of the circuit are full-bridge converter modules.

Specifically, the primary-side converter module of the bidirectional DC/DC converter shown in FIG. 4 is the same as that shown in FIGS. 2 and 3 , and the primary-side converter module includes a first switch transistor Q1, a second switch transistor Q2, and a third switch transistor Q3 and the fourth switch tube Q4 also include a resonant inductor Lr, a filter inductor Lo, a secondary busbar capacitor Co and a controller;

The difference between FIG. 4 and FIG. 2 is that the transformer module in FIG. 4 is the second transformer, and the secondary-side converter module includes a seventh switch Q7, an eighth switch Q8, a ninth switch Q9 and a tenth switch Q10 , the first switch transistor Q1, the second switch transistor Q2, the third switch transistor Q3, the fourth switch transistor Q4, the seventh switch transistor Q7, the eighth switch transistor Q8, the ninth switch transistor Q9 and the tenth switch transistor Q10 are all affected by controlled by the controller;

The drain of the first switch tube Q1 is respectively connected to the drain of the second switch tube Q2 and the positive pole P+ of the primary side of the DC/DC converter, and the source is respectively connected to the drain of the third switch tube Q3 and the source of the second transformer TX2. The second end of the side is connected; the source of the second switch Q2 is connected to the drain of the third switch Q3 and the first end of the resonant inductor Lr respectively; the source of the third switch Q3 is respectively connected to the drain of the fourth switch Q3 The source, the primary negative pole P- of the DC/DC converter is connected to the first ground terminal G1;

In the second transformer TX2, the first terminal of the secondary side is respectively connected to the source of the ninth switch Q9 and the drain of the tenth switch Q10, and the second terminal of the secondary side is respectively connected to the source of the seventh switch Q7 and the eighth switch The drain of the tube Q8 is connected; the drain of the seventh switch Q7 is connected to the drain of the ninth switch Q9 and the first end of the filter inductor Lo respectively; the source of the eighth switch Q8 is respectively connected to the tenth switch Q10 The source, the second end of the secondary bus capacitor Co, the secondary negative S- of the DC/DC converter and the third ground terminal G3 are connected; the first end of the secondary bus capacitor Co is connected to the second end of the filter inductor Lo It is connected to the positive electrode S+ of the secondary side of the DC/DC converter; wherein, the first ground terminal G1 and the third ground terminal G3 are different.

Optionally, the second transformer may be a two-winding transformer.

As shown in FIG. 2 , FIG. 3 , and FIG. 4 , the secondary-side converter module of the bidirectional DC/DC converter may be a full-bridge converter module or a half-bridge converter module. In the embodiment of the present invention, the secondary-side converter module may be represented by the first group of switches and the second group of switches.

Optionally, when the secondary-side converter module is a half-bridge converter module, the first group of switches may include a fifth switch Q5, and the second group of switches may include Q6; when the secondary-side converter module is a full-bridge converter module , the first group of switches may include Q7 and Q8, and the second group of switches may include Q9 and Q10.

In addition, Q1 and Q4 are the diagonal switch tubes of the primary side converter module, and Q2 and Q3 are the diagonal switch tubes of the primary side converter module. Q1 and Q2 together constitute the upper bridge arm of the primary side converter module, and Q3 and Q4 together constitute the lower bridge arm of the primary side converter module.

In the existing bidirectional DC/DC converter, when the energy flow direction of the converter is changed, it is generally necessary to stop and switch the wave generating mode, which is cumbersome to control and prone to errors. To solve the above problem, embodiments of the present invention provide a control method for a bidirectional converter. The control method in the embodiment of the present invention will be described below.

Referring to FIG. 5 , it shows a flowchart for realizing the control method of the bidirectional converter provided by the embodiment of the present invention. As shown in Figure 5, a bidirectional DC/DC converter is applied. The bidirectional DC/DC converter includes a primary side converter module and a secondary side converter module; the primary side converter module is a full-bridge converter module; the secondary side converter module is a full-bridge converter module; The converter module includes a first group of switches and a second group of switches on different bridge arms; the control method includes:

When the DC/DC converter is in forward working mode or reverse working mode:

S101, controlling the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module to work complementary;

S102: Determine the operating modes of the first group of switches and the second group of switches according to the switch states of the diagonal switch tubes in the primary-side converter module, and control the first group of switches and the second group of switches to work complementary according to the operating modes; wherein, The switch states of the diagonal switch tubes in the primary-side converter module are the same, and the switch states include an on state or an off state.

Optionally, the control method shown in FIG. 5 may be applied to the bidirectional DC/DC converter shown in FIG. 1 , FIG. 2 , FIG. 3 or FIG. 4 . Complementary operation means that at the same time, one and only one switch is in the on mode, and the other switch is in the off mode.

Controlling the complementary operation of the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module refers to controlling the switch tube of the upper bridge arm in the primary side rectifier module and the lower bridge arm of the corresponding position in the primary side rectifier module. The bridge arm switches work complementary.

Specifically, as shown in FIG. 2 , FIG. 3 or FIG. 4 , the primary-side converter module may include a first switch transistor Q1 , a second switch transistor Q2 , a third switch transistor Q3 and a fourth switch transistor Q4 . Control the complementary operation of the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module, which may include:

The first switch tube Q1 and the third switch tube Q3 are controlled to work complementary, and the second switch tube Q2 and the fourth switch tube Q4 are controlled to work complementary; wherein, the switching states of the first switch tube Q1 and the fourth switch tube Q4 are the same, and The switching states of the second switching transistor Q2 and the third switching transistor Q3 are the same.

Exemplarily, in one working cycle, the control process of the primary-side rectifier module is as follows:

When the first switch transistor Q1 is controlled to be in an off state, and the third switch transistor Q3 is controlled to be in an on state, the second switch transistor Q2 is controlled to be in an on state, and the fourth switch transistor Q4 is controlled to be in an off state;

When the first switch transistor Q1 is controlled to be in an on state and the third switch transistor Q3 is controlled to be in an off state, the second switch transistor Q2 is controlled to be in an off state, and the fourth switch transistor Q4 is controlled to be in an on state.

Conversely, for example, when the second switch transistor Q2 is controlled to be in an on state and the fourth switch transistor Q4 is controlled to be in an off state, the first switch transistor Q1 is controlled to be in an off state, and the third switch transistor Q3 is controlled to be in an off state. On state;

When the second switch Q2 is controlled to be in an off state and the fourth switch Q4 is controlled to be in an on state, the first switch Q1 is controlled to be on, and the third switch Q3 is controlled to be off.

In addition, since there is a delay in the switching process of the switching tube, in order to ensure that the switching tubes of the same bridge arm belonging to the left bridge arm or the right bridge arm in the primary-side rectifier module are not turned on at the same time, a dead zone will be added in the actual design. time setting. In the embodiment of the present invention, the complementary operation may include dead time, but the dead time is not the focus of the embodiment of the present invention, and will not be repeated here. The embodiment of the present invention only considers the conduction of the primary-side converter module or the secondary-side converter module. The working state of each switch tube when it is on.

By adopting a control method, the embodiment of the present invention realizes that the bidirectional DC/DC converter does not need to restart and switch the wave generating method of the converter, reduces the probability of switching errors of the converter, is easy to control, and can improve the working reliability and efficiency of the converter. work efficiency.

In the embodiment of the present invention, referring to FIG. 2 , FIG. 3 or FIG. 4 , in S101 "determine the working modes of the first group of switches and the second group of switches according to the switch states of the diagonal switch tubes in the primary side converter module" , which can include:

The working mode of the first group of switches is determined according to Q1 and Q4, and the working mode of the second group of switches is determined according to Q2 and Q3; or, the working mode of the second group of switches is determined according to Q1 and Q4, and the first group of switches is determined according to Q2 and Q3. The working mode of the group switch.

Optionally, referring to FIG. 2 or FIG. 3 , the secondary-side converter module is a half-bridge converter module. The working modes of the first group of switches and the second group of switches are determined according to the switch states of the diagonal switches in the primary-side converter module, including: comparing the switch state of the second switch Q2 and the switch state of the third switch Q3 The phase-OR operation is performed, and the obtained result is used as the working mode of the fifth switch tube Q5; the phase-OR operation is performed on the switch state of the first switch tube Q1 and the switch state of the fourth switch tube Q4, and the obtained result is used as the sixth switch tube. The working mode of Q6.

Optionally, the primary side rectifier module is 50% duty cycle phase shifted wave, the phase shift angle is recorded as the primary side phase shift angle, and the primary side phase shift angle is used to control the output of the bidirectional DC/DC converter. Q1 and Q3 are a group of complementary waves, and Q2 and Q4 are a group of complementary waves. The wave generation method of the primary-side rectifier module in forward working mode or reverse working mode is the same. The secondary-side rectifier module uses a duty cycle greater than 50% to generate waves.

6, which shows a control waveform diagram of a bidirectional DC/DC converter according to an embodiment of the present invention. As shown in Figure 6, the waveforms of Q1 and Q3 are complementary, the waveforms of Q2 and Q4 are complementary, the working mode of Q6 is the waveform phase OR of Q1 and Q4, and the working mode of Q5 is the waveform phase OR of Q2 and Q3.

The following are the waveform diagrams of the converters according to the embodiments of the present invention under different working modes: the primary side 50% duty cycle is phase-shifted to emit waves, which is soft turn-on; the secondary side is greater than 50% duty cycle, which is hard turn-on, and the secondary side is hard turn-on. The side wave can also be used in the case where the secondary side is a full bridge, which is a hard turn-on.

The first type: the primary side is the input voltage source, and the secondary side is the output resistance (or current source) load, which is in the forward working mode. Referring to FIGS. 7A to 7C , it shows a control waveform diagram of a bidirectional DC/DC converter in a forward working mode according to an embodiment of the present invention and an actual measured waveform diagram of each part. Among them, FIG. 7A is the control waveform diagram of the four switch tubes in the primary side converter module, the actual current waveform diagram of the four switch tubes and the actual voltage waveform of the four switch tubes; FIG. 7B is two in the secondary side converter module. The control waveforms of the switching tubes, the actual current waveforms of the two switching tubes, and the actual voltage waveforms of the two switching tubes; FIG. 7C is the voltage and current waveforms at other positions in the converter.

Exemplarily, in FIG. 7A , IQ1 is the current waveform diagram of the first switch transistor, Q1 is the control waveform diagram of the first switch transistor, Vds1 is the voltage waveform diagram of the first switch transistor, and other parameters are the same. In FIG. 7B , IQ5 is the current waveform diagram of the fifth switch, Q5 is the control waveform of the fifth switch, Vds5 is the voltage waveform of the fifth switch, and other parameters are the same. In Figure 7C, ILf is the current waveform of the filter inductor, ILr is the current waveform of the resonant inductor, VAB is the voltage waveform between points A and B, VCD is the voltage waveform between points C and D, VP is the voltage waveform of the primary side, and VS is the voltage waveform of the secondary side.

The second type: the primary side is the output resistance load, and the secondary side is the input voltage source, which is in the reverse working mode. Referring to FIGS. 8A to 8C , it shows a control waveform diagram of a bidirectional DC/DC converter in a reverse operation mode according to an embodiment of the present invention and an actual measured waveform diagram of each part. Among them, FIG. 8A is the control waveform diagram of the four switch tubes in the primary side converter module, the actual current waveform diagram of the four switch tubes and the actual voltage waveform of the four switch tubes; FIG. 8B is the two in the secondary side converter module. The control waveforms of the switching tubes, the actual current waveforms of the two switching tubes, and the actual voltage waveforms of the two switching tubes; FIG. 8C is the voltage and current waveforms at other positions in the converter.

The third type: the primary side is the output voltage source load, and the secondary side is the input current source, which is in the reverse working mode. Referring to FIG. 9A to FIG. 9C, it shows a control waveform diagram of another bidirectional DC/DC converter in a reverse operation mode according to an embodiment of the present invention and an actual measured waveform diagram of each part. Among them, FIG. 9A is the control waveform diagram of the four switch tubes in the primary side converter module, the actual current waveform diagram of the four switch tubes and the actual voltage waveform of the four switch tubes; FIG. 9B is the two in the secondary side converter module. The control waveforms of the switching tubes, the actual current waveforms of the two switching tubes, and the actual voltage waveforms of the two switching tubes; FIG. 9C is the voltage and current waveforms at other positions in the converter.

It can be seen from Fig. 7A to Fig. 7C, Fig. 8A to Fig. 8C and Fig. 9A to Fig. 9C that the implementation of the present invention can realize the forward and reverse non-restart wave cutting operation of the bidirectional DC/DC converter DC/DC converter, At the same time, the primary side is softly turned on and the secondary side is hard turned on, so as to improve the working efficiency and reliability of the converter.

In some embodiments of the present invention, referring to FIG. 4 , the secondary-side converter module is a full-bridge converter module. The working modes of the first group of switches and the second group of switches are determined according to the switch states of the diagonal switch tubes in the primary-side converter module, including the following two methods:

The first is to perform an OR operation on the switch state of the second switch tube Q2 and the switch state of the third switch tube Q3, and use the obtained result as the working mode of the seventh switch tube Q7; the switch state of the first switch tube Q1 Perform OR operation with the switch state of the fourth switch tube Q4, and use the obtained result as the working mode of the eighth switch tube Q8. The operation mode of the ninth switch Q9 is the same as that of the eighth switch Q8, and the operation mode of the tenth switch Q10 is the same as that of the seventh switch Q7.

Optionally, refer to FIGS. 10A to 10B , which show two NOR waveform diagrams of BUCK provided by an embodiment of the present invention; wherein, FIG. 10A is the first NOR operation waveform diagram, and FIG. 10B is the second NOR waveform diagram. In the non-operational waveform diagram, the black part is the turn-on time of the primary-side converter module of the bidirectional DC/DC converter.

Exemplarily, the full-bridge control process may also be:

Perform an OR operation on the switch state of the second switch tube Q2 and the switch state of the third switch tube Q3, perform a NOT operation on the result obtained, and use the result after the non-operation as the working mode of the seventh switch tube Q7; The switch state of the first switch Q1 and the switch state of the fourth switch Q4 are ORed, and the result obtained is NOT operated, and the negated result is used as the working mode of the eighth switch Q8. The operation mode of the ninth switch Q9 is the same as that of the eighth switch Q8, and the operation mode of the tenth switch Q10 is the same as that of the seventh switch Q7.

10A and FIG. 10B, the shaded part of the square is the conduction section that the corresponding switch tube can work, but what actually works is the high-level part shown in the figure, that is, the switch is in the shaded part of the square. All tubes can be set to high level, but the high level part shown in the figure is the best embodiment solution.

The optional OR operation is also applicable to the case where the secondary-side converter module is a half-bridge converter module.

Specifically, referring to FIG. 2 or FIG. 3 , the switch state of the second switch tube Q2 and the switch state of the third switch tube Q3 are ORed, and the obtained result is used as the working mode of the fifth switch tube Q5; The switch state of the switch tube Q1 and the switch state of the fourth switch tube Q4 are ORed, and the obtained result is used as the working mode of the sixth switch tube Q6.

11, which shows another or non-waveform diagram of BUCK provided by an embodiment of the present invention, and the black part is the turn-on moment of the primary-side converter module of the bidirectional DC/DC converter.

Specifically, the half-bridge control process may further include:

Perform an OR operation on the switch state of the second switch tube Q2 and the switch state of the third switch tube Q3, perform a NOT operation on the result obtained, and use the result after the non-operation as the working mode of the fifth switch tube Q5; The switch state of a switch Q1 and the switch state of the fourth switch Q4 are ORed, and the result obtained is NOT operated, and the result after the NOT operation is used as the working mode of the sixth switch Q6.

The shaded part of the square in FIG. 11 is the conduction section where the corresponding switch tube can work, but the high-level part shown in the figure actually works, that is, in the shaded part of the square, the switch tube can be Set to high level, but the high level part shown in the figure is the best embodiment solution.

The second is to perform NAND operation on the switching state of the second switch tube and the switching state of the third switch tube, and use the obtained result as the working mode of the seventh switch tube; compare the switch state of the first switch tube and the fourth switch tube The switch state of the tube is NANDed, and the obtained result is used as the working mode of the eighth switch tube. The operation mode of the ninth switch Q9 is the same as that of the eighth switch Q8, and the operation mode of the tenth switch Q10 is the same as that of the seventh switch Q7.

Optionally, refer to FIG. 12A to FIG. 12B, which show two NOR waveform diagrams of BOOST provided by an embodiment of the present invention; wherein, FIG. 12A is the first NOR operation waveform diagram, and FIG. 12B is the second NOR waveform diagram. In the non-operational waveform diagram, the black part is the turn-on time of the primary-side converter module of the bidirectional DC/DC converter.

Exemplarily, the full-bridge control process may also be:

Perform a NAND operation on the switch state of the second switch tube Q2 and the switch state of the third switch tube Q3, perform a non-operation on the result obtained, and use the result after the non-operation as the working mode of the seventh switch tube Q7; The switch state of the first switch Q1 and the switch state of the fourth switch Q4 are NANDed, the result obtained is negated, and the negated result is used as the working mode of the eighth switch Q8. The operation mode of the ninth switch Q9 is the same as that of the eighth switch Q8, and the operation mode of the tenth switch Q10 is the same as that of the seventh switch Q7.

The optional OR operation is also applicable to the case where the secondary-side converter module is a half-bridge converter module.

Specifically, referring to FIG. 2 or FIG. 3 , a NAND operation is performed on the switching state of the second switch tube Q2 and the switch state of the third switch tube Q3, and the obtained result is used as the working mode of the fifth switch tube Q5; The switch state of the switch tube Q1 and the switch state of the fourth switch tube Q4 are NANDed, and the obtained result is used as the working mode of the sixth switch tube Q6.

13, which shows another or non-waveform diagram of BOOST provided by an embodiment of the present invention, and the black part is the turn-on moment of the primary-side converter module of the bidirectional DC/DC converter.

Specifically, the half-bridge control process may also be:

Perform a NAND operation on the switch state of the second switch tube Q2 and the switch state of the third switch tube Q3, perform a non-operation on the obtained result, and use the result after the non-operation as the working mode of the fifth switch tube Q5; The switch state of the first switch Q1 and the switch state of the fourth switch Q4 are NANDed, the result obtained is negated, and the non-operation result is used as the working mode of the sixth switch Q6.

The implementation of the present invention can realize the forward and reverse non-restart wave-cutting operation of the bidirectional DC/DC converter DC/DC converter, and provides a phase or working mode, an NAND working mode and an OR non-working mode, and provides three working modes in total , suitable for bidirectional DC/DC converters, which can ensure the soft turn-on of the primary side and the hard turn-on of the secondary side, and improve the working efficiency and reliability of the converter.

It should be understood that the size of the sequence numbers of the steps in the above embodiments does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

The following are apparatus embodiments of the present invention, and for details that are not described in detail, reference may be made to the above-mentioned corresponding method embodiments. FIG. 9 shows a schematic structural diagram of a control device for a bidirectional converter provided by an embodiment of the present invention. For convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:

As shown in FIG. 9 , the control device 20 of the bidirectional converter is applied to the bidirectional DC/DC converter. The bidirectional DC/DC converter includes a primary side converter module and a secondary side converter module; the primary side converter module is a full bridge A converter module; the secondary side converter module includes a first group of switches and a second group of switches on different bridge arms; the device 20 may include:

The first control module 201 is configured to: control the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module to complement each other when the DC/DC converter is in the forward working mode or the reverse working mode;

The second control module 202 is configured to: determine the first group of switches and the second group of switches according to the switch states of the diagonal switch tubes in the primary-side converter module when the DC/DC converter is in the forward working mode or the reverse working mode The first group of switches and the second group of switches are controlled to work complementarily according to the operation mode; wherein, the switch states of the diagonal switches in the primary side converter module are the same, and the switch states include the on state or the off state.

In some embodiments of the present invention, the upper bridge arm in the primary side converter module includes a first switch transistor and a second switch transistor, and the lower bridge arm in the primary side converter module includes a third switch transistor and a fourth switch transistor ; The first switch tube and the second switch tube are both connected to the positive pole of the primary side of the bidirectional DC/DC converter, and the third switch tube and the fourth switch tube are both connected to the negative pole of the primary side of the bidirectional DC/DC converter; the first switch The tube and the fourth switch tube are diagonal switch tubes, and the second switch tube and the third switch tube are diagonal switch tubes; the first control module 201 may include:

The control unit is used to control the complementary operation of the first switch tube and the third switch tube, and control the complementary operation of the second switch tube and the fourth switch tube; wherein the switching states of the first switch tube and the fourth switch tube are the same, and the The switching states of the second switch tube and the third switch tube are the same.

In some embodiments of the present invention, the control unit may include: a first control sub-unit, configured to control the second switch transistor when the first switch transistor is controlled to be in an off state and the third switch transistor is controlled to be in an on state is in an on state, and controls the fourth switch tube to be in an off state;

The second control sub-unit is used to control the second switch tube to be in an off state and control the fourth switch tube to be in a conductive state when the first switch tube is controlled to be in an on state and the third switch tube is controlled to be in an off state state.

In some embodiments of the present invention, the transformer module in the bidirectional DC/DC converter is a first transformer; the first group of switches includes a fifth switch tube, and the second group of switches includes a sixth switch tube;

The first transformer, the primary side is connected to the primary side converter module, the first side of the secondary side is connected to the negative side of the secondary side of the DC/DC converter through the five switch tubes, the common terminal is connected to the positive side of the secondary side of the DC/DC converter, and the secondary side is connected to the negative side of the DC/DC converter. The second end of the side is connected to the negative pole of the secondary side of the DC/DC converter through the sixth switch tube;

The control unit may further include: a first calculation unit for performing a phase OR operation on the switch state of the second switch tube and the switch state of the third switch tube, and using the obtained result as the working mode of the fifth switch tube; The switch state of the switch tube and the switch state of the fourth switch tube are phase-ORed, and the obtained result is used as the working mode of the sixth switch tube

The second calculation unit is used to perform an OR operation on the switching state of the second switch tube and the switch state of the third switch tube, and perform a negation operation on the obtained result, and use the non-operation result as the work of the fifth switch tube mode; perform an OR operation on the switch state of the first switch tube and the switch state of the fourth switch tube, perform a NOT operation on the obtained result, and use the non-operation result as the working mode of the sixth switch tube;

The third calculation unit is used to perform a NAND operation on the switch state of the second switch tube and the switch state of the third switch tube, perform a negation operation on the obtained result, and use the non-operation result as the work of the fifth switch tube mode; perform NAND operation on the switching state of the first switch tube and the switch state of the fourth switch tube, perform a negation operation on the obtained result, and use the non-operation result as the working mode of the sixth switch tube.

In some embodiments of the present invention, the transformer module in the bidirectional DC/DC converter is a second transformer; the first group of switch tubes includes a seventh switch tube and an eighth switch tube, and the second group of switch tubes includes a ninth switch tube and the tenth switch tube; the seventh switch tube and the eighth switch tube constitute the left bridge arm of the secondary side, and the ninth switch tube and the tenth switch tube constitute the right bridge arm of the secondary side;

The second transformer, the primary side is connected to the primary side converter module, the first end of the secondary side is connected to the midpoint of the right bridge arm of the secondary side, and the second end of the secondary side is connected to the midpoint of the left bridge arm of the secondary side; the seventh switch tube and the ninth switch tube are both connected to the output positive pole of the secondary side converter module, and the eighth switch tube and the tenth switch tube are both connected to the output negative pole of the secondary side converter module;

The control unit may also include:

The third control sub-unit is used to perform an OR operation on the switching state of the second switch tube and the switching state of the third switch tube, and use the obtained result as the working mode of the seventh switch tube; Perform NOR operation with the switch state of the fourth switch tube, and use the obtained result as the working mode of the eighth switch tube; The obtained result is used as the working mode of the seventh switch tube; the switch state of the first switch tube and the switch state of the fourth switch tube are NANDed, and the obtained result is used as the work mode of the eighth switch tube; wherein, the ninth The working mode of the switch tube is the same as that of the eighth switch tube, and the working mode of the tenth switch tube is the same as that of the seventh switch tube;

The fourth control sub-unit is used to perform an OR operation on the switching state of the second switch tube and the switch state of the third switch tube, and perform a negation operation on the obtained result, and use the result after the negation as the result of the seventh switch tube. Working mode; perform an OR operation on the switch state of the first switch tube and the switch state of the fourth switch tube, perform a negation operation on the obtained result, and use the result after the negation as the working mode of the eighth switch tube; or, Perform a NAND operation on the switch state of the second switch tube and the switch state of the third switch tube, perform a non-operation on the obtained result, and use the result after the non-operation as the working mode of the seventh switch tube; Perform NAND operation on the switch state of the fourth switch tube and the switch state of the fourth switch tube, perform a negation operation on the obtained result, and use the non-operation result as the working mode of the eighth switch tube.

FIG. 15 is a schematic diagram of a controller provided by an embodiment of the present invention. As shown in FIG. 14 , the controller 30 of this embodiment includes a processor 300 , a memory 301 , and a computer program 302 stored in the memory 301 and executable on the processor 300 . When the processor 300 executes the computer program 302, the steps in each of the above-mentioned embodiments of the control method for the bidirectional converter are implemented, for example, S101 to S102 shown in FIG. 5 . Alternatively, when the processor 300 executes the computer program 302, the functions of the modules/units in the foregoing device embodiments, for example, the functions of the modules 201 to 202 shown in FIG. 14, are implemented.

Exemplarily, the computer program 302 may be divided into one or more modules/units, and the one or more modules/units are stored in the memory 301 and executed by the processor 300 to accomplish the present invention. One or more modules/units may be a series of computer program instruction segments capable of performing a specific function, the instruction segments being used to describe the execution of the computer program 302 in the controller 30 . For example, the computer program 302 can be divided into modules 201 to 202 shown in FIG. 14 .

The controller 30 may be a DSP chip or a single-chip microcomputer. The controller 30 may include, but is not limited to, a processor 300 and a memory 301 . Those skilled in the art can understand that FIG. 10 is only an example of the controller 30, and does not constitute a limitation to the controller 30, and may include more or less components than the one shown, or combine some components, or different components For example, the controller may also include input and output devices, network access devices, buses, and the like.

The so-called processor 300 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 301 may be an internal storage unit of the controller 30 , such as a hard disk or a memory of the controller 30 . The memory 301 may also be an external storage device of the controller 30, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash memory card (Flash card) equipped on the controller 30. Card), etc. Further, the memory 301 may also include both an internal storage unit of the controller 30 and an external storage device. The memory 301 is used to store computer programs and other programs and data required by the controller. The memory 301 may also be used to temporarily store data that has been output or is to be output.

An embodiment of the present invention further provides a converter, including the above controller 30 and a bidirectional DC/DC converter; the bidirectional DC/DC converter is controlled by the controller.

Optionally, the bidirectional DC/DC converter may be as shown in FIG. 2 , FIG. 3 or FIG. 4 .

Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. Module completion means dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit, and the above-mentioned integrated units may adopt hardware. It can also be realized in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present application. For the specific working processes of the units and modules in the above-mentioned system, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the foregoing embodiments, the description of each embodiment has its own emphasis. For parts that are not described or described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

In the embodiments provided by the present invention, it should be understood that the disclosed apparatus/controller and method may be implemented in other manners. For example, the device/controller embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components. May be combined or may be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

Units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer-readable storage medium. Based on this understanding, the present invention can implement all or part of the processes in the methods of the above embodiments, and can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program is in When executed by the processor, the steps of each of the foregoing control method embodiments of the bidirectional converter can be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate forms, and the like. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-Only Memory (ROM), random access memory Memory (Random Access Memory, RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in computer-readable media may be appropriately increased or decreased in accordance with the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include It is an electrical carrier signal and a telecommunication signal.

The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the present invention. within the scope of protection.

Claims (10)

1. a control method of a bidirectional converter, is characterized in that, is applied to bidirectional DC/DC converter, and described bidirectional DC/DC converter comprises primary side converter module and secondary side converter module; Described primary side converter The flow module is a full-bridge converter module; the secondary-side converter module includes a first group of switches and a second group of switches on different bridge arms; the control method includes: When the DC/DC converter is in the forward working mode or the reverse working mode: controlling the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module to work complementary; The working modes of the first group of switches and the second group of switches are determined according to the switch states of the diagonal switch tubes in the primary-side converter module, and the first group of switches and the second group of switches are controlled according to the The working modes are complementary; wherein, the switch states of the diagonal switch tubes in the primary-side converter module are the same, and the switch states include an on state or an off state. 2 . The control method of a bidirectional converter according to claim 1 , wherein the upper bridge arm in the primary side converter module comprises a first switch tube and a second switch tube, and the primary side converter module The lower bridge arm includes a third switch tube and a fourth switch tube; the first switch tube and the second switch tube are both connected to the positive pole of the primary side of the bidirectional DC/DC converter, and the third switch tube The first switch and the fourth switch are both diagonal switches, and the second switch and The third switch tube is a diagonal switch tube; Said controlling the complementary operation of the switch tube of the upper bridge arm and the switch tube of the lower bridge arm in the primary side converter module, including: The first switch tube and the third switch tube are controlled to work complementary, and the second switch tube and the fourth switch tube are controlled to work complementary; wherein, the first switch tube and the fourth switch tube The switch states are the same, and the switch states of the second switch tube and the third switch tube are the same. 3 . The control method of a bidirectional converter according to claim 2 , wherein the control of the first switch transistor and the third switch transistor to complement each other, and the control of the second switch transistor and the The complementary work of the fourth switch tube includes: When the first switch transistor is controlled to be in an off state and the third switch transistor is controlled to be in an on state, the second switch transistor is controlled to be in an on state, and the fourth switch transistor is controlled to be off state; When the first switch tube is controlled to be in an on state and the third switch tube is controlled to be in an off state, the second switch tube is controlled to be in an off state, and the fourth switch tube is controlled to be turned on state. 4 . The control method for a bidirectional converter according to claim 3 , wherein the transformer module in the bidirectional DC/DC converter is a first transformer; the first group of switches comprises a fifth switch tube, and the The second group of switches includes a sixth switch tube; In the first transformer, the primary side is connected to the primary side converter module, the first end of the secondary side is connected to the negative electrode of the secondary side of the DC/DC converter through the five switch tubes, and the common end is connected to the DC/DC converter. The positive pole of the secondary side of the DC converter is connected, and the second end of the secondary side is connected to the negative pole of the secondary side of the DC/DC converter through the sixth switch tube; The determining of the working modes of the first group of switches and the second group of switches according to the switch states of the diagonal switch tubes in the primary-side converter module includes: Perform a phase OR operation on the switching state of the second switch tube and the switching state of the third switch tube, and use the obtained result as the working mode of the fifth switch tube; take the switching state of the first switch tube Perform a phase-OR operation with the switching state of the fourth switch tube, and use the obtained result as the working mode of the sixth switch tube; or, Perform an OR operation on the switch state of the second switch tube and the switch state of the third switch tube, perform a NOT operation on the result obtained, and use the result after the NOT operation as the working mode of the fifth switch tube ; Carry out an OR operation between the switch state of the first switch tube and the switch state of the fourth switch tube, carry out a non-operation on the result obtained, and use the result after the non-operation as the work of the sixth switch tube mode; or, Perform a NAND operation on the switch state of the second switch tube and the switch state of the third switch tube, perform a negation operation on the obtained result, and use the non-operation result as the working mode of the fifth switch tube ; Carry out NAND operation on the switch state of the first switch tube and the switch state of the fourth switch tube, carry out a non-operation on the result obtained, and use the result after the non-operation as the work of the sixth switch tube model. 5 . The method for controlling a bidirectional converter according to claim 3 , wherein the transformer module in the bidirectional DC/DC converter is a second transformer; the first group of switch tubes comprises a seventh switch tube and The eighth switch tube, the second group of switch tubes includes the ninth switch tube and the tenth switch tube; the seventh switch tube and the eighth switch tube form the secondary side left bridge arm, the ninth switch tube and The tenth switch tube constitutes the right bridge arm of the secondary side; In the second transformer, the primary side is connected to the primary side converter module, the first end of the secondary side is connected to the midpoint of the right bridge arm of the secondary side, and the second end of the secondary side is connected to the middle point of the left bridge arm of the secondary side. The middle point is connected; the seventh switch tube and the ninth switch tube are both connected to the output positive pole of the secondary side converter module, and the eighth switch tube and the tenth switch tube are both connected to the secondary side The output negative pole of the converter module is connected; The determining of the working modes of the first group of switches and the second group of switches according to the switch states of the diagonal switch tubes in the primary-side converter module includes: Perform an OR operation on the switch state of the second switch tube and the switch state of the third switch tube, and use the obtained result as the working mode of the seventh switch tube; use the switch state of the first switch tube Perform an OR operation with the switch state of the fourth switch tube, and use the obtained result as the working mode of the eighth switch tube; or, Perform NAND operation on the switch state of the second switch tube and the switch state of the third switch tube, and use the obtained result as the working mode of the seventh switch tube; compare the switch state of the first switch tube Perform a NAND operation with the switching state of the fourth switch tube, and use the obtained result as the working mode of the eighth switch tube; or, Perform an OR operation on the switch state of the second switch tube and the switch state of the third switch tube, perform a NOT operation on the result obtained, and use the non-operation result as the operating mode of the seventh switch tube ; Carry out an OR operation between the switch state of the first switch tube and the switch state of the fourth switch tube, carry out a non-operation on the result obtained, and use the result after the non-operation as the work of the eighth switch tube mode; or, Perform a NAND operation on the switch state of the second switch tube and the switch state of the third switch tube, perform a negation operation on the obtained result, and use the non-operation result as the operating mode of the seventh switch tube ; Carry out NAND operation on the switch state of the first switch tube and the switch state of the fourth switch tube, carry out a non-operation on the result obtained, and use the result after the non-operation as the work of the eighth switch tube model; Wherein, the working mode of the ninth switch tube is the same as that of the eighth switch tube, and the working mode of the tenth switch tube is the same as that of the seventh switch tube. 6. The control method of a bidirectional converter according to any one of claims 1 to 3, wherein the bidirectional DC/DC converter comprises a resonant inductor, a first transformer, a filter inductor, a secondary busbar capacitance and a control The primary side converter module includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, the secondary side converter module includes a fifth switch tube and a sixth switch tube, the The first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube are all controlled by the controller; The drain of the first switch tube is respectively connected to the drain of the second switch tube and the positive pole of the primary side of the DC/DC converter, and the source is respectively connected to the drain of the third switch tube and the The second end of the primary side of the first transformer is connected; the source of the second switch tube is respectively connected to the drain of the third switch tube and the first end of the resonant inductor; the source of the third switch tube is respectively connected to the source of the fourth switch tube, the primary negative pole of the DC/DC converter and the first ground terminal; In the first transformer, the first end of the secondary side is connected to the drain of the fifth switch tube, the second end of the secondary side is connected to the drain of the sixth switch tube, and the common end is connected to the first end of the filter inductor ; The first end of the secondary busbar capacitor is connected to the second end of the filter inductor and the positive electrode of the secondary side of the DC/DC converter, respectively, and the second end is respectively connected to the source of the fifth switch tube, the The source and the second ground terminal of the sixth switch tube are connected to the anode of the secondary side of the DC/DC converter; wherein, the first ground terminal and the second ground terminal are different. 7. The control method of a bidirectional converter according to any one of claims 1 to 3, wherein the bidirectional DC/DC converter comprises a resonant inductor, a second transformer, a filter inductor, a secondary busbar capacitance and a control The primary side converter module includes a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, and the secondary side converter module includes a seventh switch tube, an eighth switch tube, a ninth switch tube A switch tube and a tenth switch tube, the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the seventh switch tube, the eighth switch tube, the ninth switch tube and the tenth switch tube are all controlled by said controller; The drain of the first switch tube is respectively connected to the drain of the second switch tube and the positive pole of the primary side of the DC/DC converter, and the source is respectively connected to the drain of the third switch tube and the The second end of the primary side of the second transformer is connected; the source of the second switch tube is respectively connected to the drain of the third switch tube and the first end of the resonant inductor; the source of the third switch tube is respectively connected to the source of the fourth switch tube, the primary negative pole of the DC/DC converter and the first ground terminal; In the second transformer, the first terminal of the secondary side is respectively connected to the source of the ninth switch tube and the drain of the tenth switch tube, and the second terminal of the secondary side is respectively connected to the source of the seventh switch tube connected to the drain of the eighth switch; the drain of the seventh switch tube is respectively connected to the drain of the ninth switch tube and the first end of the filter inductor; the source of the eighth switch tube is respectively connected to the source of the tenth switch tube, the second end of the secondary side bus capacitor, the secondary side negative pole of the DC/DC converter and the third ground terminal; The first end of the secondary bus capacitor is connected to the second end of the filter inductor and the positive electrode of the secondary side of the DC/DC converter; wherein the first ground terminal and the third ground terminal are different . 8. A controller comprising a memory and a processor, wherein a computer program that can be run on the processor is stored in the memory, wherein the processor implements claims 1 to 10 when executing the computer program Steps of any one of the control methods of the bidirectional converter in 7. 9 . A converter, characterized in that it comprises the controller according to claim 8 and a bidirectional DC/DC converter; the bidirectional DC/DC converter is controlled by the controller. 10 . 10. A computer-readable storage medium storing a computer program, characterized in that, when the computer program is executed by a processor, the two-way described in any one of the preceding claims 1 to 7 is implemented The steps of the control method of the inverter.

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