Control methods and control devices for achieving wide-range power output

Abstract

This invention discloses a control method for achieving wide-range power output, used to control the output of a resonant DC charger. The resonant DC charger includes multiple sets of resonant DC circuits and a switching circuit. The switching circuit controls the series-parallel switching of the multiple sets of resonant DC circuits. The switching circuit is a two-level / three-level bridge arm circuit and can operate in both two-level and three-level modes. The control method includes: dividing the output voltage value into multiple continuous intervals; acquiring the output voltage and determining the interval of the output voltage; adjusting the operating mode of the switching circuit according to the interval of the output voltage and controlling the switching of the switching circuit, so that the multiple sets of resonant DC circuits are connected in series or parallel. Compared with the prior art, this invention combines the switching of two-level / three-level circuits with the series-parallel switching of resonant circuits, resulting in a wider voltage output adjustment range, shorter charging time, and improved charging efficiency. This invention also discloses a corresponding control device.

Description

Technical Field

[0001] This invention relates to a resonant circuit, and more particularly to a control method and control device for achieving wide-range power output in a resonant circuit. Background Technology

[0002] With the country's vigorous development of the new energy vehicle industry, the number of electric vehicles is growing rapidly, and people's demand for electric vehicles is increasing. However, under the current battery technology, problems such as long charging time, high cost of charging piles, and high failure rate restrict the rapid development of electric vehicles. As the core component of charging piles, the charging module restricts the charging time of electric vehicles, the cost of charging piles, and their reliability. Under the current charging module technology, the output constant power range is relatively narrow, which prevents some electric vehicle models from charging at the maximum power point, thus limiting the charging time. Many manufacturers have tried to widen the constant power output range of charging modules by adding power devices, but this not only greatly increases the cost but also results in low efficiency and low reliability in the low-voltage constant power range.

[0003] Moreover, traditional LLC-structured charging pile power modules, which rely on frequency modulation, have high gain linearity and high system efficiency near the resonant frequency, and can achieve constant power output within the range near the resonant point. However, when the power module operates over a wide voltage output range, the system usually operates at a very high switching frequency, leading to a series of problems such as poor resonant current waveform, increased core and winding losses, and increased switching turn-off losses. This results in poor system efficiency, significant stability risks, and an inability to achieve a wider range of constant power output. For electric vehicle charging applications, there is usually a voltage regulation range of 2 to 3 times, such as 300V to 1000V. Traditional LLC-structured power modules severely restrict the charging time of electric vehicles and the reliability of the entire charging pile system.

[0004] Therefore, there is an urgent need for a low-cost and high-efficiency control method and control device for achieving wide-range power output of charging modules. Summary of the Invention

[0005] The purpose of this invention is to provide a control method and control device for achieving wide-range power output, which can solve the problems of excessively low output voltage or excessively high switching frequency of PWM control signal in two-level mode, and can also effectively increase the upper limit of output voltage in three-level mode, so that the voltage output adjustment range is wider.

[0006] To achieve the above objectives, this invention discloses a control method for realizing wide-range power output, used to control the output of a resonant DC charger. The resonant DC charger includes multiple sets of resonant DC circuits and a switching circuit connected between the multiple sets of resonant DC circuits. Each resonant DC circuit includes a switching circuit, a resonant circuit, and a rectifier circuit connected in sequence. The switching circuit controls the parallel and series switching of the multiple sets of resonant DC circuits. The switching circuit is a two-level / three-level bridge arm circuit and can operate in two-level mode and three-level mode respectively. The control method includes: dividing the output voltage value into multiple continuous intervals; acquiring the output voltage and determining the interval of the output voltage; adjusting the operating mode of the switching circuit according to the interval of the output voltage and controlling the switching of the switching circuit, so that the multiple sets of resonant DC circuits are connected in series or in parallel.

[0007] Compared with existing technologies, this invention divides the output voltage into multiple ranges from low to high. Based on the range of the output voltage, the corresponding operating mode of the control switch circuit and multiple sets of resonant DC circuits are connected in series and parallel. By combining the switching of two-level / three-level and the series-parallel switching of the resonant circuit, the problem of excessively low output voltage or excessively high switching frequency of PWM control signal in two-level mode can be solved. It can also effectively increase the upper limit of output voltage in three-level mode, making the voltage output adjustment range wider, and can effectively shorten the charging time, improve the charging efficiency and the reliability of the whole assembly.

[0008] Preferably, the interval includes a first interval, a second interval, a third interval, and a fourth interval that are consecutively connected.

[0009] "Adjusting the operating mode of the switching circuit based on the range of output voltage and controlling the switching of the switching circuit" specifically includes:

[0010] When the output voltage is in the first range, the switching circuit is controlled to switch to a two-level mode, and the switching circuit is controlled to operate to connect multiple sets of the resonant DC circuits in parallel.

[0011] When the output voltage is in the second range, the switching circuit is controlled to switch to a two-level mode, and the switching circuit is controlled to operate to connect multiple sets of the resonant DC circuits in series.

[0012] When the output voltage is in the third range, the switching circuit is controlled to switch to the three-level mode, and the switching circuit is controlled to operate to connect multiple sets of the resonant DC circuits in parallel.

[0013] When the output voltage is in the fourth range, the switching circuit is controlled to switch to a three-level mode, and the switching circuit is controlled to operate to connect multiple sets of the resonant DC circuits in series.

[0014] The system employs two-level parallel control in the first gear, two-level series control in the second gear, three-level parallel control in the third gear, and three-level series control in the fourth gear. By combining the switching between two-level and three-level modes with the series-parallel switching of the resonant circuit, it effectively solves the problems of excessively low output voltage or excessively high switching frequency of the PWM control signal in the two-level mode. It can also effectively increase the upper limit of the output voltage in the three-level mode, making the voltage output adjustment range wider.

[0015] Specifically, the first upper limit of the output voltage range is Uo_max, the first interval range is 0.1Uo_max~0.2Uo_max, the second interval range is 0.2Uo_max~0.4Uo_max, the third interval range is 0.4Uo_max~0.8Uo_max, and the fourth interval range is 0.8Uo_max~1.6Uo_max.

[0016] Preferably, the switching circuit includes a first switch connected between the negative terminal of the output of the preceding resonant DC circuit and the positive terminal of the output of the following resonant DC circuit, a second switch connected between the positive terminal of the output of the preceding resonant DC circuit and the positive terminal of the output of the following resonant DC circuit, and a third switch connected between the negative terminal of the output of the preceding resonant DC circuit and the negative terminal of the output of the following resonant DC circuit. Of course, the structure of the switching circuit is not limited to this embodiment.

[0017] Preferably, there are two resonant DC circuits. Of course, the number of resonant DC circuits can also be three, four, or other numbers.

[0018] Preferably, the resonant DC charger further includes a three-phase AC / DC conversion circuit disposed before the resonant DC circuit. The three-phase AC / DC conversion circuit converts the three-phase AC signal into a DC signal and sends it to the resonant DC circuit. After the step "adjusting the working mode of the switching circuit according to the range of the output voltage and controlling the switching of the switching circuit", the charger further includes: controlling the three-phase AC / DC conversion circuit to work to adjust the voltage input to the resonant circuit, and adjusting the working frequency of the switching circuit so that the optimal efficiency output voltage range Ua to Ub of the resonant DC charger is equal to the current range of the output voltage.

[0019] Preferably, the two-level / three-level bridge arm circuit includes a first branch and a second branch connected in series between the positive and negative terminals of the voltage divider circuit, a first diode and a second diode. The first branch includes a first switch, a second switch, a third switch and a fourth switch connected in series. The second branch includes a fifth switch and a sixth switch connected in series. The first diode is connected to the node between the voltage divider output terminal of the voltage divider circuit and the first and second switches. The second diode is connected to the node between the voltage divider output terminal and the third and fourth switches. The first switch is connected to a first control signal, the second and sixth switches are connected to a second control signal, the third and fifth switches are connected to a third control signal, and the fourth switch is connected to a fourth control signal. The control method controls the switching between the first and sixth switches based on the high and low levels of the first, second, third, and fourth control signals, thereby controlling the switching between the two-level mode and the three-level mode.

[0020] Specifically, the relevant switching transistors are controlled to operate with complementary 50% duty cycles by the second and third control signals, and the first and fourth switching transistors are controlled to turn off by the first and fourth control signals, so that the two-level / three-level bridge arm circuit operates in two-level mode; the relevant switching transistors are controlled to operate with complementary 50% duty cycles by the second and third control signals, and the duty cycles of the first and fourth switching transistors are adjusted by the first and fourth control signals, so that the two-level / three-level bridge arm circuit operates in three-level mode.

[0021] The present invention also discloses a wide-range power output control device, including a resonant DC charger and a control unit, wherein the resonant DC charger is as described above; the control unit includes: one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors to perform the control method for achieving wide-range power output as described above.

[0022] The present invention also discloses a computer-readable storage medium comprising a computer program for use in conjunction with an electronic device having a memory, the computer program being executable by a processor to implement a control method for a wide range of power output as described above. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the resonant DC charger in the first embodiment of the present invention.

[0024] Figure 2 This is a circuit diagram of the resonant DC charger in the first embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the wide-range power output control device in the first embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the structure of the wide-range power output control device in the second embodiment of the present invention.

[0027] Figure 5 This is a flowchart of the control method for achieving wide-range power output according to the present invention.

[0028] Figure 6 This is another flowchart of the control method for achieving wide-range power output according to the present invention.

[0029] Figure 7 This is a diagram illustrating the working process of the wide-range power output control device of the present invention. Detailed Implementation

[0030] To illustrate the technical content, structural features, objectives, and effects of the present invention in detail, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0031] This invention discloses a control method for achieving wide-range power output, used to control the output of a resonant DC charger, referenced... Figure 1 The resonant DC charger includes multiple sets of resonant DC circuits 10 and a switching circuit 20 connected between the multiple sets of resonant DC circuits 10. Each resonant DC circuit 10 includes a switching circuit 11, a resonant circuit 12, and a rectifier circuit 13 connected in sequence. The switching circuit 20 controls the parallel and series switching of the multiple sets of resonant DC circuits 10. The switching circuit 11 is a two-level / three-level bridge arm circuit and can operate in both two-level and three-level modes, dividing the output voltage value into multiple continuous intervals. Figure 5 The control method 100 includes:

[0032] (S1) Acquire the output voltage;

[0033] (S2) Determine the range of the output voltage;

[0034] (S3) Adjust the working mode of the switching circuit according to the range of the output voltage, and control the switching of the switching circuit so that multiple sets of the resonant DC circuits are connected in series or in parallel.

[0035] Specifically, the voltage output value is divided into four consecutive intervals: a first interval, a second interval, a third interval, and a fourth interval. Step (S3) specifically includes:

[0036] (S31) When the output voltage is in the first range, control the switching circuit to switch to two-level mode, and control the switching circuit to operate to connect multiple sets of resonant DC circuits in parallel.

[0037] (S32) When the output voltage is in the second range, control the switching circuit to switch to two-level mode, and control the switching circuit to operate to connect multiple sets of resonant DC circuits in series.

[0038] (S33) When the output voltage is in the third range, control the switching circuit to switch to the three-level mode, and control the switching circuit to operate to connect multiple sets of the resonant DC circuits in parallel;

[0039] (S34) When the output voltage is in the fourth range, control the switching circuit to switch to the three-level mode, and control the switching circuit to connect multiple sets of resonant DC circuits in series.

[0040] The resonant DC charger further includes a three-phase AC / DC conversion circuit (not shown) located before the resonant DC circuit. This three-phase AC / DC conversion circuit converts the three-phase AC signal into a first DC signal and transmits it to the resonant DC circuit. (Reference) Figure 5 After step (S3), the method further includes: (S4) controlling the three-phase AC / DC conversion circuit to operate in order to adjust the voltage input to the resonant circuit and adjusting the operating frequency of the switching circuit so that the optimal efficiency output voltage range Ua to Ub of the resonant DC charger is equal to the current range of the output voltage.

[0041] In this embodiment, the three-phase AC / DC conversion circuit is a three-phase Vienna AC / DC converter, and the resonant DC circuit 10 is an LLC resonant circuit DC / DC converter.

[0042] When the resonant DC circuit 10 is working, the switching circuit 11 converts the first DC signal into a square wave AC signal with alternating positive and negative signals and sends it to the resonant circuit 12. The resonant circuit 12 converts the square wave AC signal into a sine wave AC signal, performs voltage conversion, and sends it to the rectifier circuit 13. The rectifier circuit 13 rectifies the voltage-converted sine wave signal and sends it out.

[0043] The output voltage range is Uo_min-Uo_max, where Uo_max is a preset upper limit value for the output voltage. The first interval ranges from 0.1Uo_max to 0.2Uo_max, the second interval ranges from 0.2Uo_max to 0.4Uo_max, the third interval ranges from 0.4Uo_max to 0.8Uo_max, and the fourth interval ranges from 0.8Uo_max to 1.6Uo_max. The threshold between two adjacent intervals can be included in either the preceding or following interval. The highest threshold of the highest interval (fourth interval) is included in the highest interval, and the lowest threshold of the lowest interval (first interval) is included in the lowest interval.

[0044] refer to Figure 2 The switching circuit 20 includes a first switch S1 connected between the negative output terminal of the preceding resonant DC circuit 10 and the positive output terminal of the following resonant DC circuit 10, a second switch S2 connected between the positive output terminal of the preceding resonant DC circuit and the positive output terminal of the following resonant DC circuit, and a third switch S3 connected between the negative output terminal of the preceding resonant DC circuit 10 and the negative output terminal of the following resonant DC circuit 10.

[0045] In this embodiment, there are two resonant DC circuits 10. Of course, there can also be multiple resonant DC circuits 10, with the switching circuit 20 located between each pair of the multiple resonant DC circuits 10, so that the multiple resonant DC circuits 10 can form a series-parallel relationship.

[0046] refer to Figure 2The two-level / three-level bridge arm circuit 11 includes a first branch and a second branch connected in series between the positive and negative terminals of the voltage divider circuit, a first diode D1 (D7) and a second diode D2 (D8). The first branch includes a first switch Q1 (Q7), a second switch Q2 (Q8), a third switch Q3 (Q9) and a fourth switch Q4 (Q10) connected in series. The second branch includes a fifth switch Q5 (Q11) and a sixth switch Q6 (Q12) connected in series. The first diode D1 (D7) is connected at the node between the voltage divider output terminal of the voltage divider circuit and the first switch Q1 and the second switch Q2. The second diode D2 (D8) is connected at the output terminal of the voltage divider circuit and the third switch Q3 (Q9) and the fourth switch Q4 (Q10) connected in series. The nodes between switching transistors Q4 (Q10) are configured such that the first switching transistor Q1 (Q7) is connected to the first control signal DRV_1, the second switching transistor Q2 (Q8) and the sixth switching transistor Q6 (Q12) are connected to the second control signal DRV_2, the third switching transistor Q3 (Q9) and the fifth switching transistor Q5 (Q11) are connected to the third control signal DRV_3, and the fourth switching transistor Q4 (Q10) is connected to the fourth control signal DRV_4. The control method controls the switching of the first switching transistor Q1 (Q7) to the sixth switching transistor Q6 (Q12) based on the high and low levels between the first control signal DRV_1, the second control signal DRV_2, the third control signal DRV_3, and the fourth control signal DRV_4, thereby controlling the switching between two-level and three-level modes. The voltage divider circuit consists of two voltage-dividing capacitors, V_dc1 and V_dc2.

[0047] Specifically, the relevant switching transistors are controlled to operate at complementary 50% duty cycles by the second control signal DRV_2 and the third control signal DRV_3, and the first control signal DRV_1 and the fourth control signal DRV_4 are controlled to turn off the first switching transistor Q1 and the fourth switching transistor Q4, so that the two-level / three-level bridge arm circuit operates in two-level mode.

[0048] The relevant switching transistors are controlled to operate at complementary 50% duty cycles by the second control signal DRV_2 and the third control signal DRV_3, and the duty cycles of the first switching transistor Q1 (Q7) and the fourth switching transistor Q4 (Q10) are adjusted by the first control signal DRV_1 and the fourth control signal DRV_4, so that the two-level / three-level bridge arm circuit operates in three-level mode.

[0049] refer to Figure 2One primary rectifier circuit 13 consists of diodes D3-D6, and the other primary rectifier circuit 13 consists of diodes D9-D12. Lr1, Cr1, Lm1, and Tr1 form the first primary resonant network, and Lr2, Cr2, Lm2, and Tr2 form the second primary resonant network. Rload is the output load.

[0050] refer to Figure 3 The present invention also discloses a wide-range power output control device 200, including a resonant DC charger 10 and a control unit 30. The control unit 30 includes: one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors to perform the control method for achieving wide-range power output as described above. In this embodiment, the control unit 30 is a DSP chip controller.

[0051] refer to Figure 4 Unlike the above embodiments, the switching circuit 20 is connected between the resonant circuit 12 and the rectifier circuit 13, and performs parallel or series connection of the electrical signal output by the resonant circuit 12 and sends it to the rectifier circuit 13. Multiple resonant DC circuits 10 share one rectifier circuit.

[0052] The working process of the wide-range power output control device 200 of the present invention to achieve wide-range power output control is described as follows:

[0053] (S11) Collect the output voltage Uo.

[0054] (S12) Determine the range of the output voltage Uo.

[0055] (S131) ​​When the output voltage Uo is in the first range of 0.1Uo_max-0.2Uo_max, control the switching circuit 11 to switch to two-level mode, and control the switching circuit 20 to operate to connect multiple sets of resonant DC circuits 10 in parallel.

[0056] (S132) The three-phase AC / DC conversion circuit is controlled to adjust the PFC bus voltage (the voltage input to the resonant circuit 12), and outputs the corresponding first control signal, second control signal, third control signal and fourth control signal to control the operating frequency of the resonant circuit 12 so that the optimal efficiency output voltage range of the resonant DC charger is Ua~Ub=0.1Uo_max-0.2Uo_max (the first range).

[0057] (S141) When the output voltage Uo is between 0.2Uo_max and 0.4Uo_max, the switching circuit 11 is controlled to switch to a two-level mode, and the switching circuit 20 is controlled to operate to connect multiple sets of the resonant DC circuits 10 in series.

[0058] (S142) The three-phase AC / DC conversion circuit is controlled to adjust the PFC bus voltage (the voltage input to the resonant circuit 12), and outputs the corresponding first control signal, second control signal, third control signal and fourth control signal to control the operating frequency of the resonant circuit 12 so that the optimal efficiency output voltage range of the resonant DC charger is Ua~Ub=0.2Uo_max-0.4Uo_max (second range).

[0059] (S151) When the output voltage Uo is between 0.4Uo_max and 0.8Uo_max, the switching circuit 11 is controlled to switch to the three-level mode, and the switching circuit 20 is controlled to operate to connect multiple sets of the resonant DC circuits 10 in parallel.

[0060] (S152) The three-phase AC / DC conversion circuit is controlled to adjust the PFC bus voltage (the voltage input to the resonant circuit 12), and output the corresponding first control signal, second control signal, third control signal and fourth control signal to control the operating frequency of the resonant circuit 12 and the duty cycle of the switching transistors Q1 (Q7) and Q4 (Q10), so that the optimal efficiency output voltage range of the resonant DC charger is Ua~Ub=0.4Uo_max~0.8Uo_max (the third range).

[0061] (S161) When the output voltage Uo is between 0.8Uo_max and 1.6Uo_max, the switching circuit 11 is controlled to switch to a three-level mode, and the switching circuit 20 is controlled to operate to connect multiple sets of resonant DC circuits 10 in series.

[0062] (S162) The three-phase AC / DC conversion circuit is controlled to adjust the PFC bus voltage (the voltage input to the resonant circuit 12), and output the corresponding first control signal, second control signal, third control signal and fourth control signal to control the operating frequency of the resonant circuit 12 and the duty cycle of the switching transistors Q1 (Q7) and Q4 (Q10), so that the optimal efficiency output voltage range of the resonant DC charger is Ua~Ub=0.8Uo_max-1.6Uo_max (the fourth range).

[0063] In the above embodiments, the wide-range power output is a wide-range constant power output, and the control method and control device are used to control the DC charger to output a constant power voltage. The above control methods and control devices are mutually corresponding devices and methods.

[0064] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A control method for achieving wide-range power output, used to control the output of a resonant DC charger, characterized in that, The resonant DC charger includes multiple sets of resonant DC circuits and a switching circuit connected between the multiple sets of resonant DC circuits. Each resonant DC circuit includes a switching circuit, a resonant circuit, and a rectifier circuit connected in sequence. The switching circuit controls the parallel and series switching of the multiple sets of resonant DC circuits. The switching circuit is a two-level / three-level bridge arm circuit and can operate in both two-level and three-level modes. The control method includes: The output voltage value is divided into multiple consecutive intervals; Acquire the output voltage and determine the range of the output voltage; The operating mode of the switching circuit is adjusted according to the range of the output voltage, and the switching of the switching circuit is controlled so that multiple sets of the resonant DC circuits are connected in series or in parallel. The intervals include a first interval, a second interval, a third interval, and a fourth interval that are consecutively connected. "Adjusting the operating mode of the switching circuit based on the range of output voltage and controlling the switching of the switching circuit" specifically includes: When the output voltage is in the first range, the switching circuit is controlled to switch to a two-level mode, and the switching circuit is controlled to operate to connect multiple sets of the resonant DC circuits in parallel. When the output voltage is in the second range, the switching circuit is controlled to switch to a two-level mode, and the switching circuit is controlled to operate to connect multiple sets of the resonant DC circuits in series. When the output voltage is in the third range, the switching circuit is controlled to switch to the three-level mode, and the switching circuit is controlled to operate to connect multiple sets of the resonant DC circuits in parallel. When the output voltage is in the fourth range, the switching circuit is controlled to switch to a three-level mode, and the switching circuit is controlled to operate to connect multiple sets of the resonant DC circuits in series.

2. The control method for achieving wide-range power output as described in claim 1, characterized in that, The first upper limit value of the output voltage is Uo_max, the first interval range is 0.1Uo_max-0.2Uo_max, the second interval range is 0.2Uo_max-0.4Uo_max, the third interval range is 0.4Uo_max-0.8Uo_max, and the fourth interval range is 0.8Uo_max-1.6Uo_max.

3. The control method for achieving wide-range power output as described in claim 1, characterized in that, The switching circuit includes a first switch connected between the negative terminal of the output of the preceding resonant DC circuit and the positive terminal of the output of the following resonant DC circuit, a second switch connected between the positive terminal of the output of the preceding resonant DC circuit and the positive terminal of the output of the following resonant DC circuit, and a third switch connected between the negative terminal of the output of the preceding resonant DC circuit and the negative terminal of the output of the following resonant DC circuit.

4. The control method for achieving wide-range power output as described in claim 1, characterized in that, The resonant DC charger also includes a three-phase AC / DC conversion circuit located before the resonant DC circuit. The three-phase AC / DC conversion circuit converts the three-phase AC signal into a DC signal and sends it to the resonant DC circuit. After the step "adjusting the working mode of the switching circuit according to the range of the output voltage and controlling the switching of the switching circuit", the charger further includes: controlling the three-phase AC / DC conversion circuit to work to adjust the voltage input to the resonant circuit, and adjusting the working frequency of the switching circuit so that the optimal efficiency output voltage range Ua to Ub of the resonant DC charger is equal to the current range of the output voltage.

5. The control method for achieving wide-range power output as described in claim 1, characterized in that, The two-level / three-level bridge arm circuit includes a first branch and a second branch connected in series between the positive and negative terminals of the voltage divider circuit, a first diode and a second diode. The first branch includes a first switch, a second switch, a third switch and a fourth switch connected in series. The second branch includes a fifth switch and a sixth switch connected in series. The first diode is connected to the node between the voltage divider output terminal of the voltage divider circuit and the first and second switches. The second diode is connected to the node between the voltage divider output terminal and the third and fourth switches. The first switch is connected to a first control signal, the second and sixth switches are connected to a second control signal, the third and fifth switches are connected to a third control signal, and the fourth switch is connected to a fourth control signal. The control method controls the switching of the first to sixth switches based on the high and low levels between the first, second, third and fourth control signals, thereby controlling the switching between the two-level mode and the three-level mode.

6. The control method for achieving wide-range power output as described in claim 5, characterized in that, The relevant switching transistors are controlled to operate at complementary 50% duty cycles by the second and third control signals, and the first and fourth switching transistors are controlled to turn off by the first and fourth control signals, so that the two-level / three-level bridge arm circuit operates in two-level mode. The relevant switching transistors are controlled to operate at complementary 50% duty cycles by the second and third control signals, and the duty cycles of the first and fourth switching transistors are adjusted by the first and fourth control signals, so that the two-level / three-level bridge arm circuit operates in three-level mode.

7. The control method for achieving wide-range power output as described in claim 1, characterized in that, The switching circuit is connected between the resonant circuit and the rectifier circuit, and performs parallel or series connection of the electrical signal output by the resonant circuit and sends it to the rectifier circuit. Multiple resonant DC circuits share one rectifier circuit. Alternatively, the switching circuit can be connected after the rectifier circuit to connect the electrical signals output by the rectifier circuit of each resonant DC circuit in parallel or in series.

8. A wide-range power output control device, comprising a resonant DC charger and a control unit, characterized in that: The resonant DC charger includes multiple sets of resonant DC circuits and a switching circuit connected between the multiple sets of resonant DC circuits. The resonant DC circuit includes a switching circuit, a resonant circuit, and a rectifier circuit connected in sequence. The switching circuit controls the parallel and series switching of the multiple sets of resonant DC circuits. The switching circuit is a two-level / three-level bridge arm circuit and can operate in two-level mode and three-level mode respectively. The control unit includes: One or more processors; Memory; and One or more programs, wherein the one or more programs are stored in the memory and configured to be executed by one or more processors for performing a control method for achieving a wide range of power output as claimed in any one of claims 1-7.

9. A computer-readable storage medium comprising a computer program for use in conjunction with an electronic device having a memory, characterized in that: The computer program can be executed by a processor to implement a control method for wide-range power output as described in any one of claims 1-7.

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