Control Method and Device for a Test Equipment Based on an LCC Resonant Converter

Abstract

The present invention provides a control method and device for a test equipment based on an LCC resonant converter. The method includes: calculating the error quantity of a two-module LCC resonant converter, and obtaining a first modulation signal and a second modulation signal through dual-carrier hybrid control; acquiring the adjustment quantities of the first-module LCC resonant converter and the second-module LCC resonant converter; obtaining the conduction angle modulation signals of the first-module LCC resonant converter and the second-module LCC resonant converter; and obtaining a third modulation signal and a fourth modulation signal through interleaved control, so as to realize the control of the switching tubes of the two modules. By implementing the embodiments of the present application, the first modulation signal and the second modulation signal are obtained through dual-carrier hybrid control to equalize the voltage between the module LCC resonant converters, and then the output voltage ripple is reduced through output interleaved control, so that the converter can achieve zero-voltage soft switching of the switching tubes under a wide range of operating conditions and reduce the variation range of the switching frequency.

Description

Technical Field

[0001] The present invention relates to the field of control of resonant converter test equipment, and particularly to a control method and device for a test equipment based on an LCC resonant converter. Background Art

[0002] With the development of power control technology and new power devices, high-voltage, high-frequency, and high-power power supplies have been widely used. They have the advantages of high power density, high overall efficiency, and low output voltage ripple. Moreover, on the basis of adopting modular technology, the output voltage and power level of the power supply can be effectively increased, and the electrical stress of components can be reduced. Specifically for high-voltage and high-power application scenarios, an input parallel output series (IPOS) LCC resonant converter topology can be considered.

[0003] The traditional control method for the IPOS LCC resonant converter topology is mainly double-loop control. Although the double-loop control method can achieve interleaved control and voltage sharing, the adjustment between its switching frequency and conduction angle is independent and cannot be adapted, resulting in great difficulty in achieving soft switching under wide input and wide load, and it is not suitable for working in wide operating conditions. Summary of the Invention

[0004] The present invention provides a control method and device for a test equipment based on an LCC resonant converter to solve the technical problem that it is difficult to achieve soft switching under wide input and wide load in the prior art.

[0005] To solve the above technical problem, an embodiment of the present invention provides a control method for a test equipment based on an LCC resonant converter. The test equipment includes a two-module LCC resonant converter and a drive circuit. The two-module LCC resonant converter includes a first-module LCC resonant converter, a second-module LCC resonant converter, and a load;

[0006] The control method includes:

[0007] Sampling the output voltage of the two-module LCC resonant converter, calculating the error amount between the output voltage and a preset reference voltage, performing PI adjustment on the error amount, and obtaining a first modulation signal and a second modulation signal through double-carrier hybrid control; wherein, the first modulation signal is the peak value of the carrier wave and is used to control the switching frequency, and the second modulation signal is the modulation signal of the conduction angle under the reference parameter.

[0008] Obtain the output voltage of the first module LCC resonant converter and the output voltage of the second module LCC resonant converter, and then obtain the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter; superimpose the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter with the second modulation signal respectively to obtain the conduction angle modulation signal of the first module LCC resonant converter and the conduction angle modulation signal of the second module LCC resonant converter;

[0009] Perform interleaved control on the first modulation signal and the conduction angle modulation signal of the first module LCC resonant converter to obtain the third modulation signal of the first module LCC resonant converter and the fourth modulation signal of the second module LCC resonant converter; input the third modulation signal, the fourth modulation signal, the conduction angle modulation signal of the second module LCC resonant converter, and the first modulation signal into the drive circuit to obtain the drive signals of all switching tubes, and then realize the control of the switching tubes of the first module LCC resonant converter and the switching tubes of the second module LCC resonant converter.

[0010] As a preferred solution, the control of the switching tubes of the first module LCC resonant converter and the switching tubes of the second module LCC resonant converter is specifically as follows:

[0011] When the carrier signal is greater than or equal to the conduction angle modulation signal of the second module LCC resonant converter and less than the third modulation signal, control the leading leg switching tubes of the second module LCC resonant converter to flip;

[0012] When the carrier signal is greater than or equal to the third modulation signal and less than the fourth modulation signal, control the lagging leg switching tubes of the first module LCC resonant converter to flip;

[0013] When the carrier signal is greater than or equal to the fourth modulation signal and less than the first modulation signal, control the leading leg switching tubes of the first module LCC resonant converter to flip;

[0014] When the carrier signal is greater than or equal to the first modulation signal, control the lagging leg switching tubes of the second module LCC resonant converter to flip.

[0015] As a preferred solution, the third modulation signal V t Specifically:

[0016]

[0017] The fourth modulation signal V e3 Specifically:

[0018]

[0019] Among them, V m is the first modulation signal, and the V e1 is the conduction angle modulation signal of the first module LCC resonant converter.

[0020] As a preferred solution, obtaining the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter specifically includes:

[0021] Calculating the error amount of the first module LCC resonant converter according to the output voltage of the first module LCC resonant converter and the reference voltage of the first module LCC resonant converter; calculating the error amount of the second module LCC resonant converter according to the output voltage of the second module LCC resonant converter and the reference voltage of the second module LCC resonant converter;

[0022] Performing PI regulation on the error amount of the first module LCC resonant converter and the error amount of the second module LCC resonant converter respectively to obtain the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter respectively.

[0023] As a preferred solution, the reference voltage of the first module LCC resonant converter and the reference voltage of the second module LCC resonant converter are set according to the output voltage of the two-module LCC resonant converter.

[0024] Correspondingly, an embodiment of the present invention provides a control device for a test equipment based on an LCC resonant converter. The test equipment includes a two-module LCC resonant converter and a drive circuit. The two-module LCC resonant converter includes a first module LCC resonant converter, a second module LCC resonant converter, and a load;

[0025] The control device includes a sampling module, a superimposing module, and a control module; among them,

[0026] The sampling module is used to sample the output voltage of the two-module LCC resonant converter, calculate the error amount between the output voltage and a preset reference voltage, perform PI regulation on the error amount, and obtain a first modulation signal and a second modulation signal through dual-carrier hybrid control; among them, the first modulation signal is the peak value of the carrier and is used to control the switching frequency, and the second modulation signal is the modulation signal of the conduction angle under the reference parameter;

[0027] The superimposing module is used to obtain the output voltage of the first-module LCC resonant converter and the output voltage of the second-module LCC resonant converter, and further obtain the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter; superimpose the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter with the second modulation signal respectively to obtain the conduction angle modulation signal of the first-module LCC resonant converter and the conduction angle modulation signal of the second-module LCC resonant converter;

[0028] The control module is used to perform interleaved control on the first modulation signal and the conduction angle modulation signal of the first-module LCC resonant converter to obtain the third modulation signal of the first-module LCC resonant converter and the fourth modulation signal of the second-module LCC resonant converter; input the third modulation signal, the fourth modulation signal, the conduction angle modulation signal of the second-module LCC resonant converter and the first modulation signal into the drive circuit to obtain the drive signals of all switching tubes, and further realize the control of the switching tubes of the first-module LCC resonant converter and the switching tubes of the second-module LCC resonant converter.

[0029] As a preferred solution, the control module controls the switching tubes of the first-module LCC resonant converter and the switching tubes of the second-module LCC resonant converter, specifically:

[0030] When the carrier signal is greater than or equal to the conduction angle modulation signal of the second-module LCC resonant converter and less than the third modulation signal, the control module controls the leading leg switching tubes of the second-module LCC resonant converter to turn over;

[0031] When the carrier signal is greater than or equal to the third modulation signal and less than the fourth modulation signal, the control module controls the lagging leg switching tubes of the first-module LCC resonant converter to turn over;

[0032] When the carrier signal is greater than or equal to the fourth modulation signal and less than the first modulation signal, the control module controls the leading leg switching tubes of the first-module LCC resonant converter to turn over;

[0033] When the carrier signal is greater than or equal to the first modulation signal, the control module controls the lagging leg switching tubes of the second-module LCC resonant converter to turn over.

[0034] As a preferred solution, the third modulation signal V t Specifically:

[0035]

[0036] The fourth modulation signal V e3 Specifically:

[0037]

[0038] Wherein, V m is the first modulation signal, and the V e1 is the conduction angle modulation signal of the first module LCC resonant converter.

[0039] As a preferred solution, the superimposing module obtains the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter. Specifically:

[0040] The superimposing module calculates the error amount of the first module LCC resonant converter according to the output voltage and the reference voltage of the first module LCC resonant converter; calculates the error amount of the second module LCC resonant converter according to the output voltage and the reference voltage of the second module LCC resonant converter;

[0041] The error amount of the first module LCC resonant converter and the error amount of the second module LCC resonant converter are respectively subjected to PI regulation to obtain the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter respectively.

[0042] As a preferred solution, the reference voltage of the first module LCC resonant converter and the reference voltage of the second module LCC resonant converter are set according to the output voltage of the two-module LCC resonant converter.

[0043] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0044] The embodiments of the present invention provide a control method and device for a test equipment based on an LCC resonant converter. The test equipment includes a two-module LCC resonant converter and a drive circuit. The two-module LCC resonant converter includes a first-module LCC resonant converter, a second-module LCC resonant converter, and a load. The control method includes: sampling the output voltage of the two-module LCC resonant converter, calculating the error amount between the output voltage and a preset reference voltage, performing PI regulation on the error amount, and obtaining a first modulation signal and a second modulation signal through dual-carrier hybrid control. Wherein, the first modulation signal is the peak value of the carrier wave and is used to control the switching frequency, and the second modulation signal is the modulation signal of the conduction angle under the reference parameter. Obtaining the output voltage of the first-module LCC resonant converter and the output voltage of the second-module LCC resonant converter, and further obtaining the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter. Superimposing the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter with the second modulation signal respectively to obtain the conduction angle modulation signal of the first-module LCC resonant converter and the conduction angle modulation signal of the second-module LCC resonant converter. Performing interleaved control on the first modulation signal and the conduction angle modulation signal of the first-module LCC resonant converter to obtain a third modulation signal of the first-module LCC resonant converter and a fourth modulation signal of the second-module LCC resonant converter. Inputting the third modulation signal, the fourth modulation signal, the conduction angle modulation signal of the second-module LCC resonant converter, and the first modulation signal into the drive circuit to obtain the drive signals of all switching tubes, and further realizing the control of the switching tubes of the first-module LCC resonant converter and the switching tubes of the second-module LCC resonant converter. Implementing the embodiments of the present application, through dual-carrier hybrid control, obtaining a first modulation signal and a second modulation signal, and further obtaining the modulation signal of the switching frequency and the conduction angle under the reference parameter, enabling voltage sharing between module LCC resonant converters, and then reducing the output voltage ripple through output interleaved control. Compared with the traditional technical solution based on dual-loop control, the converter can achieve zero-voltage soft switching of the switching tubes and reduce the variation range of the switching frequency under a wide range of operating conditions. Description of the Drawings

[0045] Figure 1 : It is a schematic flowchart of an embodiment of the control method for the test equipment provided by the present invention based on the LCC resonant converter.

[0046] Figure 2 : It is a schematic diagram of the control principle of an embodiment of the control method for the test equipment provided by the present invention based on the LCC resonant converter.

[0047] Figure 3 : It is a schematic diagram of the topology structure of an embodiment of the test equipment provided by the present invention based on an LCC resonant converter.

[0048] Figure 4 : It is a schematic diagram of the control principle of another embodiment of the control method of the test equipment provided by the present invention based on an LCC resonant converter.

[0049] Figure 5 : It is a schematic diagram of the waveform of an output voltage of a control method without interleaved control provided by the present invention based on an LCC resonant converter.

[0050] Figure 6 : It is a schematic diagram of the waveform of an output voltage of a control method with interleaved control provided by the present invention based on an LCC resonant converter.

[0051] Figure 7 : It is a schematic diagram of the waveform of an output voltage when the resonant inductance is different provided by the present invention based on an LCC resonant converter.

[0052] Figure 8 : It is a schematic diagram of the zero-voltage soft-switching waveform of the first-module LCC resonant converter provided by the present invention.

[0053] Figure 9 : It is a schematic diagram of the zero-voltage soft-switching waveform of the second-module LCC resonant converter provided by the present invention.

[0054] Figure 10 : It is a schematic diagram of the structure of an embodiment of the control device of the test equipment provided by the present invention based on an LCC resonant converter. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0056] Embodiment 1

[0057] Please refer to Figure 1 and Figure 2 , which is a control method for a sensor test equipment for a DC distribution network based on a parallel output series (I POS) LCC resonant converter provided by an embodiment of the present invention. The topology structure diagram of the test equipment refers to Figure 3, including a two-module LCC resonant converter and a drive circuit, where the two-module LCC resonant converter includes a first-module LCC resonant converter, a second-module LCC resonant converter, and a load R L ; The control method includes steps S1 to S3; where

[0058] Step S1, sample the output voltage of the two-module LCC resonant converter, calculate the error amount between the output voltage and a preset reference voltage, perform PI regulation on the error amount, and obtain a first modulation signal and a second modulation signal through dual-carrier hybrid control; where the first modulation signal is the peak value of the carrier and is used to control the switching frequency, and the second modulation signal is the modulation signal of the conduction angle under the reference parameter

[0059] Step S2, obtain the output voltage of the first-module LCC resonant converter and the output voltage of the second-module LCC resonant converter, and then obtain the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter; superimpose the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter on the second modulation signal respectively, and obtain the conduction angle modulation signal of the first-module LCC resonant converter and the conduction angle modulation signal of the second-module LCC resonant converter

[0060] Step S3, perform interleaved control on the first modulation signal and the conduction angle modulation signal of the first-module LCC resonant converter to obtain a third modulation signal of the first-module LCC resonant converter and a fourth modulation signal of the second-module LCC resonant converter; input the third modulation signal, the fourth modulation signal, the conduction angle modulation signal of the second-module LCC resonant converter, and the first modulation signal into the drive circuit to obtain the drive signals of all switching tubes, and then realize the control of the switching tubes of the first-module LCC resonant converter and the switching tubes of the second-module LCC resonant converter

[0061] In this embodiment, the control process and principle can also refer to Figure 2 , the sampled output voltage of the two-module LCC resonant converter is V o , the total reference voltage is V ref , calculate the error amount between the output voltage V o and the preset reference voltage V ref , after PI regulation, perform calculation using dual-carrier hybrid control to obtain two modulation signals, which are the first modulation signal V m and the second modulation signal V n .

[0062] Optionally, the reference voltage of the first module LCC resonant converter and the reference voltage of the second module LCC resonant converter can be set according to the output voltage V of the two-module LCC resonant converter. o For example, V o / 2 is used as the reference voltage of the first module LCC resonant converter and the second module LCC resonant converter.

[0063] The reference voltage V o / 2 is respectively compared with the output voltage V o1 of the first module LCC resonant converter and the output voltage V o2 of the second module LCC resonant converter. The error amount of the first module LCC resonant converter and the error amount of the second module LCC resonant converter are calculated. The error amount of the first module LCC resonant converter and the error amount of the second module LCC resonant converter are both subjected to PI regulation to respectively obtain the regulation amount ΔV e1 of the first module LCC resonant converter and the regulation amount ΔV e2 of the second module LCC resonant converter. After superimposing the two regulation amounts with V n , the conduction angle modulation signals V e1 of the first module LCC resonant converter and the conduction angle modulation signal V e2 of the second module LCC resonant converter are respectively obtained.

[0064] The first modulation signal V m and the conduction angle modulation signal V e1 of the first module LCC resonant converter are subjected to interleaved control to obtain the third modulation signal V t and the fourth modulation signal V e3 of the first module LCC resonant converter. The third modulation signal V t , the fourth modulation signal V e3 , the conduction angle modulation signal V e2 of the second module LCC resonant converter and the first modulation signal V m are input to the drive circuit to obtain the drive signals of all the switching tubes S1 to S8, thereby realizing the control of the switching tubes S1 to S4 of the first module LCC resonant converter and the switching tubes S5 to S8 of the second module LCC resonant converter.

[0065] As a preferred embodiment, the third modulation signal V t is specifically:

[0066]

[0067] The fourth modulation signal Ve3 Specifically:

[0068]

[0069] Among them, V m is the first modulation signal, and the V e1 is the conduction angle modulation signal of the first module LCC resonant converter.

[0070] Further, referring to Figure 4 , the control of the switching tubes of the first module LCC resonant converter and the switching tubes of the second module LCC resonant converter is specifically as follows:

[0071] When the carrier signal v saw is greater than or equal to the conduction angle modulation signal V e2 (not shown in the figure) of the second module LCC resonant converter and less than the third modulation signal V t , control the leading leg switching tubes S5 and S6 of the second module LCC resonant converter to flip;

[0072] When the carrier signal is greater than or equal to the third modulation signal V t and less than the fourth modulation signal V e3 , control the lagging leg switching tubes S3 and S4 of the first module LCC resonant converter to flip;

[0073] When the carrier signal is greater than or equal to the fourth modulation signal V e3 and less than the first modulation signal V m , control the leading leg switching tubes S1 and S2 of the first module LCC resonant converter to flip;

[0074] When the carrier signal is greater than or equal to the first modulation signal V m , control the lagging leg switching tubes S7 and S8 of the second module LCC resonant converter to flip. It should be noted that Figure 4 although what is shown in e is V e2 instead of V e2 , but this figure is introduced with a single-module LCC resonant converter as an example, so it is actually V

[0075] Implementing the embodiments of the present application, the switching frequency f s and the conduction angle δ under the reference parameters can be obtained through the voltage stabilizing loop. The voltage equalizing loop adjusts the conduction angle δ iEqualize the voltage between the first module LCC resonant converter and the second module LCC resonant converter, and then reduce the output voltage ripple through interleaved control. Compared with the traditional double-loop control method, this control method can enable the converter to achieve zero-voltage soft switching of the switching tubes under a wide range of operating conditions and reduce the variation range of the switching frequency. Figure 5 and Figure 6 are the output voltage waveforms without and with interleaved control. By comparing the two waveform diagrams, it can be seen that the total output voltage ripple without interleaved control is 7.96 V, while the output voltage ripple with interleaved control is 1.02 V. Figure 7 It can be seen that when the resonant inductors are different, the entire module achieves voltage equalization control, interleaved control, and regulated output. According to Figure 8 and Figure 9 shown, the switching tubes of each module also achieve zero-voltage soft switching (i Lr1 is the resonant current of the first module, v AB1 is the drive voltage of the first module, i Lr2 is the resonant current of the second module and v AB2 is the drive voltage of the second module).

[0076] Correspondingly, referring to Figure 10 , the embodiment of the present invention provides a control device for a test equipment based on an LCC resonant converter. The test equipment includes a two-module LCC resonant converter and a drive circuit. The two-module LCC resonant converter includes a first-module LCC resonant converter, a second-module LCC resonant converter, and a load;

[0077] The control device includes a sampling module 101, a superimposing module 102, and a control module 103; wherein,

[0078] The sampling module 101 is configured to sample the output voltage of the two-module LCC resonant converter, calculate the error amount between the output voltage and a preset reference voltage, perform PI adjustment on the error amount, and obtain a first modulation signal and a second modulation signal through dual-carrier hybrid control; wherein, the first modulation signal is the peak value of the carrier and is used to control the switching frequency, and the second modulation signal is the modulation signal of the conduction angle under the reference parameter;

[0079] The superimposing module 102 is configured to obtain the output voltage of the first module LCC resonant converter and the output voltage of the second module LCC resonant converter, and further obtain the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter; superimpose the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter with the second modulation signal respectively to obtain the conduction angle modulation signal of the first module LCC resonant converter and the conduction angle modulation signal of the second module LCC resonant converter;

[0080] The control module 103 is configured to perform interleaved control on the first modulation signal and the conduction angle modulation signal of the first module LCC resonant converter to obtain the third modulation signal of the first module LCC resonant converter and the fourth modulation signal of the second module LCC resonant converter; input the third modulation signal, the fourth modulation signal, the conduction angle modulation signal of the second module LCC resonant converter and the first modulation signal into the drive circuit to obtain the drive signals of all the switching tubes, and further realize the control of the switching tubes of the first module LCC resonant converter and the switching tubes of the second module LCC resonant converter.

[0081] As a preferred solution, the control module 103 controls the switching tubes of the first module LCC resonant converter and the switching tubes of the second module LCC resonant converter, specifically:

[0082] When the carrier signal is greater than or equal to the conduction angle modulation signal of the second module LCC resonant converter and less than the third modulation signal, the control module 103 controls the leading leg switching tubes of the second module LCC resonant converter to turn over;

[0083] When the carrier signal is greater than or equal to the third modulation signal and less than the fourth modulation signal, the control module 103 controls the lagging leg switching tubes of the first module LCC resonant converter to turn over;

[0084] When the carrier signal is greater than or equal to the fourth modulation signal and less than the first modulation signal, the control module 103 controls the leading leg switching tubes of the first module LCC resonant converter to turn over;

[0085] When the carrier signal is greater than or equal to the first modulation signal, the control module 103 controls the lagging leg switching tubes of the second module LCC resonant converter to turn over.

[0086] As a preferred solution, the third modulation signal V t Specifically:

[0087]

[0088] The fourth modulation signal V e3 Specifically:

[0089]

[0090] Among them, V m is the first modulation signal, and the V e1 is the conduction angle modulation signal of the first module LCC resonant converter.

[0091] As a preferred solution, the superimposing module 102 obtains the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter. Specifically:

[0092] The superimposing module 102 calculates the error amount of the first module LCC resonant converter according to the output voltage and the reference voltage of the first module LCC resonant converter; calculates the error amount of the second module LCC resonant converter according to the output voltage and the reference voltage of the second module LCC resonant converter;

[0093] The error amount of the first module LCC resonant converter and the error amount of the second module LCC resonant converter are respectively subjected to PI adjustment to obtain the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter.

[0094] As a preferred solution, the reference voltage of the first module LCC resonant converter and the reference voltage of the second module LCC resonant converter are set according to the output voltage of the two-module LCC resonant converter.

[0095] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0096] An embodiment of the present invention provides a control method and device for a test device based on an LCC resonant converter. The test device includes a two-module LCC resonant converter and a drive circuit. The two-module LCC resonant converter includes a first-module LCC resonant converter, a second-module LCC resonant converter, and a load. The control method includes: sampling the output voltage of the two-module LCC resonant converter, calculating the error amount between the output voltage and a preset reference voltage, performing PI regulation on the error amount, and obtaining a first modulation signal and a second modulation signal through dual-carrier hybrid control. Wherein, the first modulation signal is the peak value of the carrier and is used to control the switching frequency, and the second modulation signal is the modulation signal of the conduction angle under the reference parameter; obtaining the output voltage of the first-module LCC resonant converter and the output voltage of the second-module LCC resonant converter, and further obtaining the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter; superimposing the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter with the second modulation signal respectively to obtain the conduction angle modulation signal of the first-module LCC resonant converter and the conduction angle modulation signal of the second-module LCC resonant converter; performing interleaved control on the first modulation signal and the conduction angle modulation signal of the first-module LCC resonant converter to obtain a third modulation signal of the first-module LCC resonant converter and a fourth modulation signal of the second-module LCC resonant converter; inputting the third modulation signal, the fourth modulation signal, the conduction angle modulation signal of the second-module LCC resonant converter, and the first modulation signal into the drive circuit to obtain the drive signals of all switching tubes, and further realizing the control of the switching tubes of the first-module LCC resonant converter and the switching tubes of the second-module LCC resonant converter. Implementing the embodiments of the present application, through dual-carrier hybrid control, a first modulation signal and a second modulation signal are obtained, and then the modulation signals of the switching frequency and the conduction angle under the reference parameter are obtained, so that the voltage sharing between the module LCC resonant converters is achieved, and then the output voltage ripple is reduced through output interleaved control. Compared with the traditional technical solution based on dual-loop control, the converter can achieve zero-voltage soft switching of the switching tubes under a wide range of operating conditions and reduce the variation range of the switching frequency.

[0097] In the specific embodiments described above, the purpose, technical solution, and beneficial effects of the present invention have been further described in detail. It should be understood that the above description is only for the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for a test device based on an LCC resonant converter, characterized in that, The test device includes a two-module LCC resonant converter and a drive circuit. The two-module LCC resonant converter includes a first-module LCC resonant converter, a second-module LCC resonant converter, and a load; The control method includes: Sampling the output voltage of the two-module LCC resonant converter, calculating the error amount between the output voltage and a preset reference voltage, performing PI regulation on the error amount, and obtaining a first modulation signal and a second modulation signal through dual-carrier hybrid control; wherein, the first modulation signal is the peak value of the carrier wave and is used to control the switching frequency, and the second modulation signal is the modulation signal of the conduction angle under a reference parameter; Obtaining the output voltage of the first-module LCC resonant converter and the output voltage of the second-module LCC resonant converter, and further obtaining the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter; superimposing the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter with the second modulation signal respectively to obtain the conduction angle modulation signal of the first-module LCC resonant converter and the conduction angle modulation signal of the second-module LCC resonant converter; Performing interleaved control on the first modulation signal and the conduction angle modulation signal of the first-module LCC resonant converter to obtain a third modulation signal of the first-module LCC resonant converter and a fourth modulation signal of the second-module LCC resonant converter; inputting the third modulation signal, the fourth modulation signal, the conduction angle modulation signal of the second-module LCC resonant converter, and the first modulation signal into the drive circuit to obtain the drive signals of all switching tubes, and further realizing the control of the switching tubes of the first-module LCC resonant converter and the switching tubes of the second-module LCC resonant converter; When the carrier signal is greater than or equal to the conduction angle modulation signal of the second-module LCC resonant converter and less than the third modulation signal, controlling the leading leg switching tubes of the second-module LCC resonant converter to turn over; When the carrier signal is greater than or equal to the third modulation signal and less than the fourth modulation signal, controlling the lagging leg switching tubes of the first-module LCC resonant converter to turn over; When the carrier signal is greater than or equal to the fourth modulation signal and less than the first modulation signal, controlling the leading leg switching tubes of the first-module LCC resonant converter to turn over; When the carrier signal is greater than or equal to the first modulation signal, controlling the lagging leg switching tubes of the second-module LCC resonant converter to turn over.

2. The control method of a test device based on an LCC resonant converter according to claim 1, characterized in that, The third modulation signal V t Specifically: ； Fourth modulation signal V e3 Specifically: ； Among them, V m is the first modulation signal, and V e1 is the conduction angle modulation signal of the first module LCC resonant converter.

3. The control method of a test device based on an LCC resonant converter according to claim 2, wherein The obtaining of the adjustment amount of the first-module LCC resonant converter and the adjustment amount of the second-module LCC resonant converter is specifically: Calculate the error quantity of the first-module LCC resonant converter based on the output voltage and the reference voltage of the first-module LCC resonant converter; calculate the error quantity of the second-module LCC resonant converter based on the output voltage and the reference voltage of the second-module LCC resonant converter. Perform PI regulation on the error quantity of the first-module LCC resonant converter and the error quantity of the second-module LCC resonant converter respectively to obtain the regulation quantity of the first-module LCC resonant converter and the regulation quantity of the second-module LCC resonant converter.

4. A control method for a test device based on an LCC resonant converter according to any one of claims 1 to 3, characterized in that, The reference voltage of the first-module LCC resonant converter and the reference voltage of the second-module LCC resonant converter are set according to the output voltage of the two-module LCC resonant converter.

5. A control device for a test equipment based on an LCC resonant converter, characterized in that, The test equipment includes a two-module LCC resonant converter and a drive circuit. The two-module LCC resonant converter includes a first-module LCC resonant converter, a second-module LCC resonant converter, and a load. The control device includes a sampling module, a superposition module, and a control module; wherein, The sampling module is configured to sample the output voltage of the two-module LCC resonant converter, calculate the error quantity between the output voltage and a preset reference voltage, perform PI regulation on the error quantity, and obtain a first modulation signal and a second modulation signal through dual-carrier hybrid control; wherein, the first modulation signal is the peak value of the carrier and is used to control the switching frequency, and the second modulation signal is the modulation signal of the conduction angle under the reference parameter. The superposition module is configured to obtain the output voltage of the first-module LCC resonant converter and the output voltage of the second-module LCC resonant converter, and further obtain the regulation quantity of the first-module LCC resonant converter and the regulation quantity of the second-module LCC resonant converter; superimpose the regulation quantity of the first-module LCC resonant converter and the regulation quantity of the second-module LCC resonant converter with the second modulation signal respectively to obtain the conduction angle modulation signal of the first-module LCC resonant converter and the conduction angle modulation signal of the second-module LCC resonant converter. The control module is configured to perform interleaved control on the first modulation signal and the conduction angle modulation signal of the first-module LCC resonant converter to obtain a third modulation signal of the first-module LCC resonant converter and a fourth modulation signal of the second-module LCC resonant converter; input the third modulation signal, the fourth modulation signal, the conduction angle modulation signal of the second-module LCC resonant converter, and the first modulation signal into the drive circuit to obtain the drive signals of all switching tubes, and further realize the control of the switching tubes of the first-module LCC resonant converter and the switching tubes of the second-module LCC resonant converter. When the carrier signal is greater than or equal to the conduction angle modulation signal of the second module LCC resonant converter and less than the third modulation signal, the control module controls the leading leg switch of the second module LCC resonant converter to turn over; When the carrier signal is greater than or equal to the third modulation signal and less than the fourth modulation signal, the control module controls the lagging leg switch of the first module LCC resonant converter to turn over; When the carrier signal is greater than or equal to the fourth modulation signal and less than the first modulation signal, the control module controls the leading leg switch of the first module LCC resonant converter to turn over; When the carrier signal is greater than or equal to the first modulation signal, the control module controls the lagging leg switch of the second module LCC resonant converter to turn over.

6. The control device of a test equipment based on an LCC resonant converter according to claim 5, characterized in that, The third modulation signal V t Specifically: ； The fourth modulation signal V e3 Specifically: ； Among them, V m is the first modulation signal, and V e1 is the conduction angle modulation signal of the first module LCC resonant converter.

7. The control device of a test equipment based on an LCC resonant converter as claimed in claim 5, wherein, The superimposing module obtains the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter. Specifically: The superimposing module calculates the error amount of the first module LCC resonant converter according to the output voltage of the first module LCC resonant converter and the reference voltage of the first module LCC resonant converter; calculates the error amount of the second module LCC resonant converter according to the output voltage of the second module LCC resonant converter and the reference voltage of the second module LCC resonant converter; The error amount of the first module LCC resonant converter and the error amount of the second module LCC resonant converter are respectively subjected to PI adjustment to obtain the adjustment amount of the first module LCC resonant converter and the adjustment amount of the second module LCC resonant converter.

8. The control device of a test equipment based on an LCC resonant converter according to any one of claims 5 to 7, characterized in that, The reference voltage of the first module LCC resonant converter and the reference voltage of the second module LCC resonant converter are set according to the output voltage of the two-module LCC resonant converter.

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