Topology Reconfiguration Modular Multilevel Power Amplifier

Abstract

The topology reconfigurable modular multi-level power amplifier belongs to the field of ultra-precision motor drive technology. The invention solves the problem that the existing linear power amplifier works in the linear amplification area of ​​the switch device, has high loss and low efficiency, thus limiting the improvement of the power level. It includes: a power supply, a multi-level circuit and a filter circuit. The multi-level circuit includes: power switches are cascaded in sequence, resonant capacitors are respectively connected in parallel with the power switches, and fast capacitors C q1 Connect to the power switch S n+1 The source of the power switch S n+4 Between the drain of, ..., the fast capacitor C q(n+1) Connect the source of power switch S1 to the power switch S 2n+4 The drain of S1 is connected to the positive terminal of the power supply, and S 2n+4 The source is connected to the negative terminal of the power supply, and the power switch S n+2 The source is connected to the input end of the filter circuit, and the output end of the filter circuit is connected to the motor coil winding load. The invention is used for an ultra-precision motor system.

Description

Technical Field

[0001] The invention relates to a multi-level power amplifier, and belongs to the technical field of ultra-precision motor driving. Background Art

[0002] Power amplifiers are mainly divided into linear power amplifiers, hybrid power amplifiers and switching power amplifiers. Among them, although the signal distortion of linear power amplifiers meets the requirements, they are large in size, low in efficiency, low in power, and require a complex water cooling system, which makes it difficult to meet the needs of high voltage and high power applications. Hybrid power amplifiers are a combination of linear power amplifiers and switching power amplifiers, which improves the efficiency of the system to a certain extent, but the linear unit of the power amplifier will be affected by the performance of the previous switching unit, and the system structure is relatively complex.

[0003] In addition, the positioning accuracy required for semiconductor manufacturing is in the nanometer range, which places strict requirements on the output current accuracy and bandwidth of various types of power amplifiers involved in motor drive. Therefore, it is of great significance to study the switching power amplifier with high fidelity, wide bandwidth, high voltage and high power for the performance of ultra-precision motor system.

[0004] The traditional power amplifier uses a three-level power amplifier, such as Figure 6 As shown in the figure, the load side realizes three-level output, and the multi-level synthesis method is used to reduce the distortion of the load side voltage (current), and also reduce the voltage stress of the device. However, since the device works under the condition of hard switching, the efficiency of the system is limited. In the occasions requiring extremely high positioning accuracy, it is necessary to provide high dynamic and high-precision response current. The output current ripple and loss of the traditional multi-level power amplifier are still large and cannot meet the application requirements. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing linear power amplifier works in the linear amplification region of the switching device, has high loss and low efficiency, thereby limiting the improvement of the power level, and provide a topology reconfigurable modular multi-level power amplifier.

[0006] The topology reconfigurable modular multi-level power amplifier of the present invention comprises a power supply, a multi-level circuit and a filter circuit;

[0007] The multi-level circuit includes power switches S1, S2, S3, ..., S 2n+3 , S 2n+4 , resonant capacitor C r1 , C r2 , C r3 ,…,C r(2n+3) , C r(2n+4) and the flying capacitor C q1 , C q2, C q3 ,…,C q(n) , C q(n+1) ; n is a positive integer greater than or equal to 3;

[0008] The source of the power switch S1 is connected to the drain of the power switch S2, the source of the power switch S2 is connected to the drain of the power switch S3, the source of the power switch S3 is connected to the drain of the power switch S4, ..., the power switches S 2n+3 The source of the power switch S 2n+4 The drain;

[0009] Resonant capacitor C r1 , C r2 , C r3 ,…,C r(2n+3) , C r(2n+4) Respectively with power switches S1, S2, S3, ..., S 2n+3 , S 2n+4 in parallel;

[0010] Fast capacitor C q1 Connect to the power switch S n+1 The source of the power switch S n+4 Between the drain and the fast capacitor C q2 Connect to the power switch S n The source of the power switch S n+5 Between the drain and the fast capacitor C q3 Connect to the power switch S n-1 The source of the power switch S n+6 Between the drain of, ..., the fast capacitor C q(n) Connect the source of power switch S2 to the power switch S 2n+3 Between the drain and the fast capacitor C q(n+1) Connect the source of power switch S1 to the power switch S 2n+4 Between the drain electrodes;

[0011] The drain of the power switch S1 is connected to the positive terminal of the power supply. 2n+4 The source electrode is connected to the negative terminal of the power supply;

[0012] The power switch S n+2 The source is connected to the input end of the filter circuit, and the output end of the filter circuit is connected to the motor coil winding load.

[0013] Preferably, the motor coil winding load includes an inductance L, a resistance R and a motor back electromotive force e f ;

[0014] One end of the inductor L is connected to one end of the resistor R, and the other end of the resistor R is connected to the motor back EMF e f The positive pole of the motor, the motor back EMF ef The negative pole of the inductor is grounded, and the other end of the inductor L serves as the input end of the motor coil winding load.

[0015] Preferably, the filter circuit adopts an LCL filter circuit, and the LCL filter circuit includes a filter capacitor C f1 , C f2 and filter inductor L f ;

[0016] Filter capacitor C f1 One end is connected to the positive terminal of the power supply, and the filter capacitor C f2 One end is connected to the negative terminal of the power supply, and the filter capacitor C f1 The other end of the filter capacitor C f2 The other end of the filter capacitor C f1 With filter capacitor C f2 The connection point of the filter inductor L f One end of the filter capacitor C f1 With filter capacitor C f2 The connection point is used as the output end of the filter circuit, and the filter inductor L f The other end of the filter circuit serves as the input end.

[0017] Preferably, the filter circuit adopts an LCCL filter circuit, and the LCCL filter circuit includes a filter capacitor C f1 , C f2 and filter inductor L f ;

[0018] Filter capacitor C f1 One end is connected to the motor back EMF f The negative pole of the filter capacitor C f2 One end is connected to the negative terminal of the power supply, and the filter capacitor C f1 The other end of the filter capacitor C f2 The other end of the filter capacitor C f1 With filter capacitor C f2 The connection point of the filter inductor L f One end of the filter capacitor C f1 With filter capacitor C f2 The connection point is used as the output end of the filter circuit, and the filter inductor L f The other end of the filter circuit serves as the input end.

[0019] Preferably, the multi-level circuit includes m circuits, where m is a positive integer greater than or equal to 2; the number of power supplies and filter circuits are both m;

[0020] A multi-level circuit, a power supply and a filter circuit are connected as a module, m modules are connected in parallel, and the output ends of the m filter circuits are all connected to the motor coil winding load.

[0021] Preferably, the power supply adopts a positive and negative dual power supply.

[0022] Preferably, the resonant capacitor C r1 , C r2 , C r3 ,…,C r(2n+3) , C r(2n+4) Use external capacitors or power switches S1, S2, S3, ..., S 2n+3 , S 2n+4 of parasitic capacitance.

[0023] Preferably, it comprises a power supply, a full-bridge seven-level circuit and a filter circuit;

[0024] The full-bridge seven-level circuit includes power switches S1 to S 20 , resonant capacitor C r1 ~C r20 and the flying capacitor C q1 ~C q8 ;

[0025] Power switch S1~S 10 The power switches S 11 ~S 20 The two bridge arms are connected in parallel to form a full-bridge circuit.

[0026] Resonant capacitor C r1 ~C r20 Respectively with power switches S1~S 20 in parallel;

[0027] Fast capacitor C q1 Connected between the source of power switch S4 and the drain of power switch S7, fast capacitor C q2 Connected between the source of power switch S3 and the drain of power switch S8, fast capacitor C q3 Connected between the source of power switch S2 and the drain of power switch S9, fast capacitor C q4 Connect the source of power switch S1 to the power switch S 10 Between the drain and the fast capacitor C q5 Connect to the power switch S 14 The source of the power switch S 17 Between the drain and the fast capacitor C q6 Connect to the power switch S 13 The source of the power switch S 18 Between the drain and the fast capacitor Cq7 Connect to the power switch S 12 The source of the power switch S 19 Between the drain and the fast capacitor C q8 Connect to the power switch S 11 The source of the power switch S 20 Between the drain electrodes;

[0028] The drain of power switch S1 and the power switch S 11 The drain of the power switch S is connected to the positive terminal of the power supply. 10 The source and power switch S 20 The source of is connected to the negative terminal of the power supply at the same time;

[0029] The filter circuit includes a filter capacitor C f1 and filter inductor L f ;

[0030] The motor coil winding load includes the inductance L, the resistance R and the motor back EMF e f ;

[0031] Filter inductor L f One end of the filter inductor is connected to the source of the power switch S5 and the drain of the power switch S6. f The other end is connected to the power switch S 15 The source and power switch S 16 The drain, filter inductor L f The other end is connected to the filter capacitor C f1 One end and the motor back EMF e f The negative pole of the filter capacitor C f1 The other end is connected to one end of the inductor L and the power switch S 15 The other end of the inductor L is connected to one end of the resistor R, and the other end of the resistor R is connected to the motor back EMF e f The positive electrode.

[0032] Preferably, the power supply is a positive DC power supply.

[0033] Advantages of the present invention: The topologically reconfigurable modular multi-level power amplifier proposed by the present invention operates in a topologically-operated manner so that the device operates in a soft switching state, reducing losses and improving efficiency. At the same time, the nonlinear distortion of the output voltage (current) is reduced by multi-level voltage synthesis, the torque fluctuation of the motor load is small, the harmonic content is low, and the voltage stress at both ends of the switch device of the switch-type power amplifier is reduced, which can meet the needs in high-power or ultra-precision positioning occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1is a schematic diagram of the structure of a topology reconfigurable modular multi-level power amplifier according to Embodiment 1 of the present invention;

[0035] Figure 2 2 is a schematic diagram of the structure of a topology-reconstructed modular multi-level power amplifier using an LCL filter circuit in Embodiment 2 of the present invention;

[0036] Figure 3 2 is a schematic diagram of the structure of a topology reconfigurable modular multi-level power amplifier using an LCCL filter circuit in Embodiment 2 of the present invention;

[0037] Figure 4 1 is a schematic diagram of the structure of a topology reconfigurable modular multi-level power amplifier using m-way multi-level circuits in Embodiment 3 of the present invention;

[0038] Figure 5 4 is a schematic diagram of the structure of a topology reconfigurable modular multi-level power amplifier using a full-bridge seven-level circuit in Embodiment 4 of the present invention;

[0039] Figure 6 It is a structural schematic diagram of a three-level power amplifier in the prior art. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0043] Embodiment 1:

[0044] Combine the following Figure 1 This embodiment is described. A topology reconfigurable modular multi-level power amplifier described in this embodiment includes a power supply, a multi-level circuit and a filter circuit;

[0045] The multi-level circuit includes power switches S1, S2, S3, ..., S 2n+3 , S 2n+4 , resonant capacitor C r1 , C r2 , C r3 ,…,C r(2n+3) , C r(2n+4)and the flying capacitor C q1 , C q2 , C q3 ,…,C q(n) , C q(n+1) ; n is a positive integer greater than or equal to 3;

[0046] The source of the power switch S1 is connected to the drain of the power switch S2, the source of the power switch S2 is connected to the drain of the power switch S3, the source of the power switch S3 is connected to the drain of the power switch S4, ..., the power switches S 2n+3 The source of the power switch S 2n+4 The drain;

[0047] Resonant capacitor C r1 , C r2 , C r3 ,…,C r(2n+3) , C r(2n+4) Respectively with power switches S1, S2, S3, ..., S 2n+3 , S 2n+4 in parallel;

[0048] Fast capacitor C q1 Connect to the power switch S n+1 The source of the power switch S n+4 Between the drain and the fast capacitor C q2 Connect to the power switch S n The source of the power switch S n+5 Between the drain and the fast capacitor C q3 Connect to the power switch S n-1 The source of the power switch S n+6 Between the drain of, ..., the fast capacitor C q(n) Connect the source of power switch S2 to the power switch S 2n+3 Between the drain and the fast capacitor C q(n+1) Connect the source of power switch S1 to the power switch S 2n+4 Between the drain electrodes;

[0049] The drain of the power switch S1 is connected to the positive terminal of the power supply. 2n+4 The source electrode is connected to the negative terminal of the power supply;

[0050] The power switch S n+2 The source is connected to the input end of the filter circuit, and the output end of the filter circuit is connected to the motor coil winding load.

[0051] Furthermore, the motor coil winding load includes an inductance L, a resistance R and a motor back electromotive force e f ;

[0052] One end of the inductor L is connected to one end of the resistor R, and the other end of the resistor R is connected to the motor back EMF e f The positive pole of the motor, the motor back EMF e f The negative pole of the inductor is grounded, and the other end of the inductor L serves as the input end of the motor coil winding load.

[0053] In this implementation, the inductor L is used to perform filtering together with the filter circuit.

[0054] Embodiment 2:

[0055] Combine the following Figure 2 and Figure 3 This embodiment describes another topology reconfigurable modular multi-level power amplifier. When n=3, the multi-level circuit is a half-bridge seven-level circuit. The half-bridge seven-level circuit includes power switches S1 to S2. 10 , resonant capacitor C r1 ~C r10 and the flying capacitor C q1 ~C q4 ;

[0056] The source of the power switch S1 is connected to the drain of the power switch S2, the source of the power switch S2 is connected to the drain of the power switch S3, the source of the power switch S3 is connected to the drain of the power switch S4, the source of the power switch S4 is connected to the drain of the power switch S5, the source of the power switch S5 is connected to the drain of the power switch S6, the source of the power switch S6 is connected to the drain of the power switch S7, the source of the power switch S7 is connected to the drain of the power switch S8, the source of the power switch S8 is connected to the drain of the power switch S9, and the source of the power switch S9 is connected to the drain of the power switch S 10 The drain;

[0057] Resonant capacitor C r1 ~C r10 Respectively with power switches S1~S 10 in parallel;

[0058] Fast capacitor C q1 Connected between the source of power switch S4 and the drain of power switch S7, fast capacitor C q2 Connected between the source of power switch S3 and the drain of power switch S8, fast capacitor C q3 Connected between the source of power switch S2 and the drain of power switch S9, fast capacitor C q4 Connect the source of power switch S1 to the power switch S 10 Between the drain electrodes;

[0059] The drain of the power switch S1 is connected to the positive terminal of the power supply. 10 The source electrode is connected to the negative terminal of the power supply;

[0060] The source of the power switch S5 is connected to the input end of the filter circuit, and the output end of the filter circuit is connected to the motor coil winding load.

[0061] Furthermore, the filter circuit adopts an LCL filter circuit, and the LCL filter circuit includes a filter capacitor C f1 , C f2 and filter inductor L f ;

[0062] Filter capacitor C f1 One end is connected to the positive terminal of the power supply, and the filter capacitor C f2 One end is connected to the negative terminal of the power supply, and the filter capacitor C f1 The other end of the filter capacitor C f2 The other end of the filter capacitor C f1 With filter capacitor C f2 The connection point of the filter inductor L f One end of the filter capacitor C f1 With filter capacitor C f2 The connection point is used as the output end of the filter circuit, and the filter inductor L f The other end of the filter circuit serves as the input end.

[0063] Furthermore, the filter circuit adopts an LCCL filter circuit, and the LCCL filter circuit includes a filter capacitor C f1 , C f2 and filter inductor L f ;

[0064] Filter capacitor C f1 One end is connected to the motor back EMF f The negative pole of the filter capacitor C f2 One end is connected to the negative terminal of the power supply, and the filter capacitor C f1 The other end of the filter capacitor C f2 The other end of the filter capacitor C f1 With filter capacitor C f2 The connection point of the filter inductor L f One end of the filter capacitor C f1 With filter capacitor C f2 The connection point is used as the output end of the filter circuit, and the filter inductor L f The other end of the filter circuit serves as the input end.

[0065] Embodiment 3:

[0066] Combine the following Figure 4This embodiment is described. In another topology reconfigurable modular multi-level power amplifier described in this embodiment, when n=3, the multi-level circuit is a half-bridge seven-level circuit, the multi-level circuit includes m circuits, m is a positive integer greater than or equal to 2; the number of power supply and filter circuits are both m;

[0067] A multi-level circuit, a power supply and a filter circuit are connected as a module, m modules are connected in parallel, and the output ends of the m filter circuits are all connected to the motor coil winding load.

[0068] The m-way multi-level circuit includes a power switch S 1x , S 2x , S 3x ,…,S 9x , S 10x , resonant capacitor C r1x , C r2x , C r3x ,…,C r9x , C r10x and the flying capacitor C q1x , C q2x , C q3x , C q4x ; x = 1, 2, 3, ..., m;

[0069] Power switch S 1x , S 2x , S 3x ,…,S 9x , S 10x Cascade in sequence,

[0070] Resonant capacitor C r1x , C r2x , C r3x ,…,C r9x , C r10x Respectively with the power switch S 1x , S 2x , S 3x ,…,S 9x , S 10x in parallel;

[0071] Fast capacitor C q1x Connect to the power switch S 4x The source of the power switch S 7x Between the drain and the fast capacitor C q2x Connect to the power switch S 3x The source of the power switch S 8x Between the drain and the fast capacitor C q3x Connect to the power switch S 2x The source of the power switch S 9x Between the drain and the fast capacitor C q4xConnect to the power switch S 1x The source of the power switch S 10x Between the drain electrodes;

[0072] Power switch S 1x The drain of the power switch S is connected to the positive terminal of the power supply. 10x The source electrode is connected to the negative terminal of the power supply;

[0073] The filter circuit includes a filter capacitor C f1x , C f2x and filter inductor L fx ;

[0074] Filter capacitor C f1x One end is connected to the positive terminal of the power supply, and the filter capacitor C f2x One end is connected to the negative terminal of the power supply, and the filter capacitor C f1x The other end of the filter capacitor C f2x The other end of the filter capacitor C f1x With filter capacitor C f2x The connection point of the filter inductor L fx One end of the filter capacitor C f1x With filter capacitor C f2x The connection point is used as the output end of the filter circuit, and the filter inductor L fx The other end of the filter circuit serves as the input end.

[0075] Furthermore, the power supply adopts a positive and negative dual power supply.

[0076] Embodiment 4:

[0077] Combine the following Figure 5 This embodiment is described. Another topology reconfigurable modular multi-level power amplifier described in this embodiment includes a power supply, a full-bridge seven-level circuit and a filter circuit;

[0078] The full-bridge seven-level circuit includes power switches S1 to S 20 , resonant capacitor C r1 ~C r20 and the flying capacitor C q1 ~C q8 ;

[0079] Power switch S1~S 10 The power switches S 11 ~S 20 The two bridge arms are connected in parallel to form a full-bridge circuit.

[0080] Resonant capacitor C r1 ~C r20 Respectively with power switches S1~S20 in parallel;

[0081] Fast capacitor C q1 Connected between the source of power switch S4 and the drain of power switch S7, fast capacitor C q2 Connected between the source of power switch S3 and the drain of power switch S8, fast capacitor C q3 Connected between the source of power switch S2 and the drain of power switch S9, fast capacitor C q4 Connect the source of power switch S1 to the power switch S 10 Between the drain and the fast capacitor C q5 Connect to the power switch S 14 The source of the power switch S 17 Between the drain and the fast capacitor C q6 Connect to the power switch S 13 The source of the power switch S 18 Between the drain and the fast capacitor C q7 Connect to the power switch S 12 The source of the power switch S 19 Between the drain and the fast capacitor C q8 Connect to the power switch S 11 The source of the power switch S 20 Between the drain electrodes;

[0082] The drain of power switch S1 and the power switch S 11 The drain of the power switch S is connected to the positive terminal of the power supply. 10 The source and power switch S 20 The source of is connected to the negative terminal of the power supply at the same time;

[0083] The filter circuit includes a filter capacitor C f1 and filter inductor L f ;

[0084] The motor coil winding load includes the inductance L, the resistance R and the motor back EMF e f ;

[0085] Filter inductor L f One end of the filter inductor is connected to the source of the power switch S5 and the drain of the power switch S6. f The other end is connected to the power switch S 15 The source and power switch S 16 The drain, filter inductor L f The other end is connected to the filter capacitor C f1 One end and the motor back EMF e f The negative pole of the filter capacitor C f1The other end is connected to one end of the inductor L and the power switch S 15 The other end of the inductor L is connected to one end of the resistor R, and the other end of the resistor R is connected to the motor back EMF e f The positive electrode.

[0086] Furthermore, the power supply adopts a positive DC power supply.

[0087] Furthermore, the resonant capacitor adopts an external capacitor or a parasitic capacitor of a power switch.

[0088] Furthermore, the power switch adopts a MOSFET, a GTR or an IGBT with an anti-parallel body diode.

[0089] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A topology reconfigurable modular multi-level power amplifier, characterized in that: It includes a power supply, a multi-level circuit and a filter circuit; The multi-level circuit includes power switches S1, S2, S3, ..., S 2n+3 , S 2n+4 , resonant capacitor C r1 , C r2 , C r3 ,…,C r(2n+3) , C r(2n+4) and the flying capacitor C q1 , C q2 , C q3 ,…,C q(n) , C q(n+1) ; n is a positive integer greater than or equal to 3; The source of the power switch S1 is connected to the drain of the power switch S2, the source of the power switch S2 is connected to the drain of the power switch S3, the source of the power switch S3 is connected to the drain of the power switch S4, ..., the power switches S 2n+3 The source of the power switch S 2n+4 The drain; Resonant capacitor C r1 , C r2 , C r3 ,…,C r(2n+3) , C r(2n+4) Respectively with power switches S1, S2, S3, ..., S 2n+3 , S 2n+4 in parallel; Fast capacitor C q1 Connect to the power switch S n+1 The source of the power switch S n+4 Between the drain and the fast capacitor C q2 Connect to the power switch S n The source of the power switch S n+5 Between the drain and the fast capacitor C q3 Connect to the power switch S n-1 The source of the power switch S n+6 Between the drain of, ..., the fast capacitor C q(n) Connect the source of power switch S2 to the power switch S 2n+3 Between the drain and the fast capacitor C q(n+1) Connect the source of power switch S1 to the power switch S 2n+4 Between the drain electrodes; The drain of the power switch S1 is connected to the positive terminal of the power supply. 2n+4 The source electrode is connected to the negative terminal of the power supply; The power switch S n+2 The source is connected to the input end of the filter circuit, and the output end of the filter circuit is connected to the motor coil winding load.

2. The topology reconfigurable modular multi-level power amplifier according to claim 1, characterized in that: The motor coil winding load includes an inductance L, a resistance R and a motor back electromotive force e f ; One end of the inductor L is connected to one end of the resistor R, and the other end of the resistor R is connected to the motor back EMF e f The positive pole of the motor, the motor back EMF e f The negative pole of the inductor is grounded, and the other end of the inductor L serves as the input end of the motor coil winding load.

3. The topology reconfigurable modular multi-level power amplifier according to claim 1, characterized in that: The filter circuit adopts an LCL filter circuit, which includes a filter capacitor C f1 , C f2 and filter inductor L f ; Filter capacitor C f1 One end is connected to the positive terminal of the power supply, and the filter capacitor C f2 One end is connected to the negative terminal of the power supply, and the filter capacitor C f1 The other end of the filter capacitor C f2 The other end of the filter capacitor C f1 With filter capacitor C f2 The connection point of the filter inductor L f One end of the filter capacitor C f1 With filter capacitor C f2 The connection point is used as the output end of the filter circuit, and the filter inductor L f The other end of the filter circuit serves as the input end.

4. The topology reconfigurable modular multi-level power amplifier according to claim 2, characterized in that: The filter circuit adopts an LCCL filter circuit, and the LCCL filter circuit includes a filter capacitor C f1 , C f2 and filter inductor L f ; Filter capacitor C f1 One end is connected to the motor back EMF f The negative pole of the filter capacitor C f2 One end is connected to the negative terminal of the power supply, and the filter capacitor C f1 The other end of the filter capacitor C f2 The other end of the filter capacitor C f1 With filter capacitor C f2 The connection point of the filter inductor L f One end of the filter capacitor C f1 With filter capacitor C f2 The connection point is used as the output end of the filter circuit, and the filter inductor L f The other end of the filter circuit serves as the input end.

5. The topology reconfigurable modular multi-level power amplifier according to claim 1, characterized in that: The multi-level circuit includes m circuits, where m is a positive integer greater than or equal to 2; the number of power supplies and filter circuits are both m; A multi-level circuit, a power supply and a filter circuit are connected as a module, m modules are connected in parallel, and the output ends of the m filter circuits are all connected to the motor coil winding load.

6. The topology reconfigurable modular multi-level power amplifier according to claim 1, characterized in that: The power supply adopts a positive and negative dual power supply.

7. The topology reconfigurable modular multi-level power amplifier according to claim 1, characterized in that: Resonant capacitor C r1 , C r2 , C r3 ,…,C r(2n+3) , C r(2n+4) Use external capacitors or power switches S1, S2, S3, ..., S 2n+3 , S 2n+4 of parasitic capacitance.

8. Topology reconfigurable modular multi-level power amplifier, characterized in that: It includes a power supply, a full-bridge seven-level circuit and a filter circuit; The full-bridge seven-level circuit includes power switches S1 to S 20 , resonant capacitor C r1 ~C r20 and the flying capacitor C q1 ~C q8 ; Power switch S1~S 10 The power switches S 11 ~S 20 The two bridge arms are connected in parallel to form a full-bridge circuit. Resonant capacitor C r1 ~C r20 Respectively with power switches S1~S 20 in parallel; Fast capacitor C q1 Connected between the source of power switch S4 and the drain of power switch S7, the fast capacitor C q2 Connected between the source of power switch S3 and the drain of power switch S8, fast capacitor C q3 Connected between the source of power switch S2 and the drain of power switch S9, fast capacitor C q4 Connect the source of power switch S1 to the power switch S 10 Between the drain and the fast capacitor C q5 Connect to the power switch S 14 The source of the power switch S 17 Between the drain and the fast capacitor C q6 Connect to the power switch S 13 The source of the power switch S 18 Between the drain and the fast capacitor C q7 Connect to the power switch S 12 The source of the power switch S 19 Between the drain and the fast capacitor C q8 Connect to the power switch S 11 The source of the power switch S 20 Between the drain electrodes; The drain of power switch S1 and the power switch S 11 The drain of the power switch S is connected to the positive terminal of the power supply. 10 The source and power switch S 20 The source of is connected to the negative terminal of the power supply at the same time; The filter circuit includes a filter capacitor C f1 and filter inductor L f ; The motor coil winding load includes the inductance L, the resistance R and the motor back EMF e f ; Filter inductor L f One end of the filter inductor is connected to the source of the power switch S5 and the drain of the power switch S6. f The other end is connected to the power switch S 15 The source and power switch S 16 The drain, filter inductor L f The other end is connected to the filter capacitor C f1 One end and the motor back EMF e f The negative pole of the filter capacitor C f1 The other end is connected to one end of the inductor L and the power switch S 15 The other end of the inductor L is connected to one end of the resistor R, and the other end of the resistor R is connected to the motor back EMF e f The positive electrode.

9. The topology reconfigurable modular multi-level power amplifier according to claim 8, characterized in that: The power supply adopts a positive DC power supply.

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