CN107947616B

CN107947616B - Soft switch power amplifier

Info

Publication number: CN107947616B
Application number: CN201711288641.1A
Authority: CN
Inventors: 寇宝泉; 韦坚; 张海林
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2017-12-07
Filing date: 2017-12-07
Publication date: 2019-12-31
Anticipated expiration: 2037-12-07
Also published as: CN107947616A

Abstract

The invention discloses a soft switching power amplifier, and belongs to the field of motor drive control. The soft switching power amplifier includes: the system comprises a direct-current power supply unit, an inverter loop, a resonant network and a filter network; the resonant network is connected between the power supply end of the direct current power supply unit and the output end of the inversion loop; the inverter loop is used for converting the direct current output by the direct current power supply unit into alternating current and transmitting the alternating current to a load through the filter network. The semiconductor switch device of the power amplifier works in a soft switch state, so the power amplifier has the characteristics of high current control precision, quick dynamic response, high efficiency, low noise and the like.

Description

Soft switch power amplifier

Technical Field

The invention belongs to the field of motor drive control, and particularly relates to a soft switching power amplifier.

Background

A PWM (Pulse Width Modulation) hard switching power amplifier is widely used in a servo drive system because of its low cost and simple control. With the increase of the power level of the driver, the hard switching characteristic of the driver causes large switching loss and serious heat generation of the power amplifier, and the reliability and the service life of the system are reduced. Hard switching is difficult to achieve high driver frequencies due to switching losses, and soft switching power amplifiers have emerged to improve system efficiency and switching frequency.

The existing soft switching power amplifier circuit is shown in fig. 1, the circuit realizes a soft switching technology by adding a passive lossless absorption circuit, improves the switching condition of a power switching device by utilizing the self resonance process of the passive device, reduces the turn-off loss of a switching tube, and simultaneously effectively transfers the energy stored by the passive lossless absorption circuit during the turn-on period of the switching tube.

Due to the adoption of a passive soft switching mode, the passive soft switching circuit has the defects that the ZCS (Zero Current Switch)/ZVS (Zero Voltage Switch) condition is related to the change of the switching frequency, the load and the like, and when the factors such as the switching frequency (load) and the like change, the operation of the resonant mode of the circuit cannot be well ensured; the voltage stress of the anti-parallel diode in the main circuit is large, and the two low-frequency tubes are still in a hard switching state. Particularly, when the circuit is applied to the precise motion control occasion, the two low-frequency tubes are switched when the output current passes through zero, so that the zero-crossing distortion of the output current can be caused, and the output current ripple after the switching frequency is increased is still large and cannot meet the application requirement.

Disclosure of Invention

The invention aims to solve the problems of the existing soft switching power amplifier, and provides a soft switching power amplifier which aims to realize that a bridge type topological circuit works in a full-period bias current mode, reduce output current ripples and voltage stress, realize soft switching under the condition of full load (large current and small current) and meet the requirements under the occasions of high-power or ultra-precise motion control.

A soft-switched power amplifier, comprising: the system comprises a direct-current power supply unit, an inverter loop, a resonant network and a filter network;

the resonant network is connected between the power supply end of the direct current power supply unit and the output end of the inversion loop;

the inverter loop is used for converting the direct current output by the direct current power supply unit into alternating current and transmitting the alternating current to a load through the filter network.

Preferably, the inverter circuit includes at least one first-type half-bridge switching power unit, each first-type half-bridge switching power unit includes a first-type dual-voltage-drop half-bridge inverter composed of two parallel bridge arms, and when a plurality of first-type half-bridge switching power units are provided, the first-type half-bridge switching power units are connected in parallel;

the bridge arms comprise a first class of bridge arms and a second class of bridge arms, and the first class of double-voltage-drop half-bridge inverter is formed by connecting the first class of bridge arms and the second class of bridge arms in parallel;

the positive end of the first class bridge arm is connected with the positive end of the direct-current power supply unit, and the negative end of the first class bridge arm is connected with the negative end of the direct-current power supply unit;

and the negative end of the second type bridge arm is connected with the positive end of the direct-current power supply unit, and the positive end of the second type bridge arm is connected with the negative end of the direct-current power supply unit.

The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.

The soft switching power amplifier has the advantages that the bridge topology circuit can work in a full-period bias current mode, output current ripples and voltage stress are reduced, soft switching can be realized under the condition of full load (large current and small current), and the defects of the conventional soft switching power amplifier are overcome, so that the requirements on high-power or ultra-precise motion control occasions are met. The soft switching power amplifier has the characteristics of high current control precision, quick dynamic response, high efficiency, low noise and the like, and has wide application prospects in the fields of high-performance driving of motors, alternating current and direct current power supplies and the like.

Drawings

Fig. 1 is a circuit diagram of a conventional soft switching power amplifier;

fig. 2 is a circuit diagram of one embodiment of a half-bridge parallel soft-switching power amplifier of the present invention;

fig. 3 is a circuit diagram of one embodiment of a half-bridge soft switching power amplifier of the present invention;

fig. 4 is a circuit diagram of an embodiment of a full bridge parallel soft switching power amplifier of the present invention;

fig. 5 is a circuit diagram of an embodiment of a full bridge soft switching power amplifier of the present invention;

fig. 6 is a circuit diagram of an embodiment of a three-phase full-bridge parallel soft-switching power amplifier of the present invention;

fig. 7 is a circuit diagram of an embodiment of a three-phase full-bridge soft-switching power amplifier according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

the resonant network is connected between the power supply end of the direct current power supply unit and the output end of the inverter loop;

the inversion loop is used for converting direct current output by the direct current power supply unit into alternating current and transmitting the alternating current to a load through the filter network.

In this embodiment, the soft switching power amplifier can realize that the bridge topology circuit works in a full-period bias current mode, reduce output current ripples and voltage stress, and can realize soft switching under the condition of full load (large current and small current), thereby overcoming the defects of the existing soft switching power amplifier and meeting the requirements on high-power or ultra-precise motion control occasions. The soft switching power amplifier has the characteristics of high current control precision, quick dynamic response, high efficiency, low noise and the like, and has wide application prospects in the fields of high-performance driving of motors, alternating current and direct current power supplies and the like.

In a preferred embodiment, the inverter circuit includes at least one first-type half-bridge switching power unit, each first-type half-bridge switching power unit includes a first-type dual-buck half-bridge inverter composed of two parallel bridge arms, and when the first-type half-bridge switching power units are multiple, the first-type half-bridge switching power units are connected in parallel;

the bridge arms comprise a first type of bridge arm and a second type of bridge arm, and the first type of double-voltage-drop half-bridge inverter is formed by connecting the first type of bridge arm and the second type of bridge arm in parallel;

In the present embodiment, the dc power supply unit includes a positive dc power supply and a negative dc power supply.

When the inverter circuit comprises a double-droop half-bridge inverter, the soft-switching power amplifier is a half-bridge soft-switching power amplifier, as shown in fig. 3, and the half-bridge inverter circuit is formed by power switching devices S₁,S₂Diode D₁,D₂And a resonance capacitor C_s1,C_s2Composition, power switch device S₁And diode D₁The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₂Positive terminal of (2) and diode D₂The anode ends of the two bridge arms are connected to form another bridge arm, and the two bridge arms are connected in parallel to form a half bridge; resonant capacitor C_s1,C_s2Respectively in sequence with corresponding power switches S₁,S₂And are connected in parallel.

When the inverter circuit includes a plurality of parallel double-voltage-drop half-bridge inverters, the soft-switching power amplifier is a half-bridge parallel soft-switching power amplifier, as shown in fig. 2, the half-bridge parallel inverter circuit is composed of a power switching device S₁,S₂,……,S_2i-1,S_2i,……,S_2N-1,S_2NDiode D₁,D₂,……,D_2i-1,D_2i,……,D_2N-1,D_2NAnd a resonance capacitor C_s1,C_s2,……,C_s2i-1,C_s2i,……,C_s2N-1,C_s2NAnd (4) forming. Power switch device S₁And diode D₁The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₂Positive terminal of (2) and diode D₂The anode ends of the two bridge arms are connected to form another bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S_2N-1And diode D_2N-1The cathode end of the power switch is connected to form a shunt bridge arm_2NPositive terminal of (2) and diode D_2NThe anode ends of the two half-bridges are connected to form another shunt bridge arm, the two bridge arms are connected in parallel to form another half-bridge, and the two half-bridges are connected in parallel to form the double-buck multi-half-bridge inverter under the large current. The positive terminal of the double-step-down multi-half bridge inverter is connected to the positive terminal of the direct-current power supply, and the negative terminal of the double-step-down multi-half bridge inverter is connected to the negative terminal of the direct-current power supply. Similarly, the corresponding power switch device S_2i-1And diode D_2i-1The cathode end of the power switch is connected to form a shunt bridge arm_2iPositive terminal of (2) and diode D_2iThe anode ends of the two bridge arms are connected to form another shunt bridge arm, and the two bridge arms are connected in parallel to form another half bridge. Resonant capacitor C_s1,C_s2,……,C_s2NRespectively in sequence with corresponding power switches S₁,S₂,……,S_2NAnd (4) connecting in parallel.

Wherein i is 1,2,3, … …, N is positive integer, S_2i-1Denotes the 2i-1 th power switch device, S_2iDenotes the 2 i-th power switch device, D_2i-1Denotes the 2i-1 th diode, D_2iDenotes the 2 i-th diode, C_s2i-1Denotes the 2i-1 th resonance capacitance, C_s2iRepresenting the 2 i-th resonance capacitance. Resonant capacitor C_s1,C_s2,……,C_s2N-1,C_s2NCan be an external capacitor or a power switch device S₁,S₂,……,,S_2N-1,S_2NInternal parasitic capacitance.

In the above embodiment, the first bridge arm is a bridge arm composed of the 2i-1 th power switch device S and the corresponding 2i-1 th diode D, and the second bridge arm is a bridge arm composed of the 2 i-th power switch device S and the corresponding 2 i-th diode D.

In a preferred embodiment, the resonant network comprises a resonant capacitor formed by a first voltage-dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third voltage dividing capacitor C_d3The number of the resonance modules is the same as that of the bridge arms, wherein N is a positive integer;

voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the DC power supply unit and a voltage-dividing capacitor C_d1One end of the voltage divider is connected with the positive end of the direct current power supply unit and the voltage dividing capacitor C_d3One end of the positive electrode is connected with the negative electrode end of the direct current power supply unit;

the resonance module includes: the first type of resonance module corresponds to the first type of bridge arm, and the second type of resonance module corresponds to the second type of bridge arm;

the input end of the first type resonance module is connected with the first voltage division capacitor C_d1And a second voltage dividing capacitor C_d2The output end of the first type resonance module is connected with the output end of the first type bridge arm to form a resonant loop;

the input end of the second type resonance module is connected with a second voltage division capacitor C_d2And a third partial capacitance C_d3And the output end of the second type resonance module is connected with the output end of the second type bridge arm to form a resonant loop.

In this embodiment, when the inverter circuit includes a double-droop half-bridge inverter, the soft-switching power amplifier is a half-bridge soft-switching power amplifier, and the resonant network is formed by power switching devices S 'as shown in fig. 3'₁,S′₂Diode D'₁,D′₂Resonant inductor L'₁,L′₂First voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3And (4) forming. Power switchOff device S'₁Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₁Is connected to the resonant inductor L'₁One end of (1), resonant inductor L'₁Is connected at the other end to a diode D'₁Anode terminal of (1), diode D'₁Is connected to the power switch device S₁The negative terminal of (1); power switching device S'₂Is connected to the power switch device S₂Positive electrode terminal of (1), power switching device S'₂Is connected to the resonant inductor L'₂One end of (1), resonant inductor L'₂Is connected at the other end to a diode D'₂Anode terminal of (1), diode D'₂Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the DC power supply unit and a voltage-dividing capacitor C_d1One end of the voltage divider is connected with the positive end of the direct current power supply unit and the voltage dividing capacitor C_d3One end of which is connected to the negative terminal of the dc power supply unit.

When the inverter circuit comprises a plurality of parallel double-voltage-drop half-bridge inverters, the soft switching power amplifier is a half-bridge parallel soft switching power amplifier, and as shown in fig. 2, the resonant network is formed by a power switching device S'₁,S′₂,……,S′_2i-1,S′_2i,……,S′_2N-1,S′_2NDiode D'₁,D′₂,……,D′_2i-1,D′_2i,……,D′_2N-1,D′_2NResonant inductor L'₁,L′₂,……,L′_2i-1,L′_2i,……,L′_2N-1,L′_2NFirst voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3And (4) forming. Power switching device S'₁Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₁Is connected to the resonant inductor L'₁One end of (1), resonant inductor L'₁Is connected at the other end to a diode D'₁Anode terminal of (1), diode D'₁Is connected to the power switch device S₁The negative terminal of (1); power switching device S'₂Is connected to the power switch device S₂Positive electrode terminal of (1), power switching device S'₂Is connected to the resonant inductor L'₂One end of (1), resonant inductor L'₂Is connected at the other end to a diode D'₂Anode terminal of (1), diode D'₂Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'_2N-1Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'_2N-1Is connected to the resonant inductor L'_2N-1One end of (1), resonant inductor L'_2N-1Is connected at the other end to a diode D'_2N-1Anode terminal of (1), diode D'_2N-1Is connected to the power switch device S_2N-1The negative terminal of (1); power switching device S'_2NIs connected to the power switch device S_2NPositive electrode terminal of (1), power switching device S'_2NIs connected to the resonant inductor L'_2NOne end of (1), resonant inductor L'_2NIs connected at the other end to a diode D'_2NAnode terminal of (1), diode D'_2NIs connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a). Similarly, the corresponding power switch device S'_2i-1Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'_2i-1Is connected to the resonant inductor L'_2i-1One end of (1), resonant inductor L'_2i-1Is connected at the other end to a diode D'_2i-1Anode terminal of (1), diode D'_2i-1Is connected to the power switch device S_2i-1The negative terminal of (1); power switching device S'_2iIs connected to the power switch device S_2iPositive terminal of (2), power switchDevice S'_2iIs connected to the resonant inductor L'_2iOne end of (1), resonant inductor L'_2iIs connected at the other end to a diode D'_2iAnode terminal of (1), diode D'_2iIs connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a). Voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the DC power supply unit and a voltage-dividing capacitor C_d1One end of the voltage divider is connected with the positive end of the direct current power supply unit and the voltage dividing capacitor C_d3One end of which is connected to the negative terminal of the dc power supply unit.

In this embodiment, the first type of resonant module is a resonant module composed of a 2i-1 st power switch device S ', a corresponding 2i-1 st diode D ', and a corresponding 2i-1 st resonant inductor L '; the second type of resonance module is a resonance module consisting of a 2i power switch device S ', a corresponding 2i diode D ' and a corresponding 2i resonance inductor L '.

In a preferred embodiment, the filter network comprises a first filter capacitor C_f1A second filter capacitor C_f2The number of the filter modules is the same as that of the bridge arms, wherein N is a positive integer;

a first filter capacitor C_f1And a second filter capacitor C_f2A first filter capacitor C connected in series with two ends of the DC power supply unit_f1One end of the second filter capacitor C is connected with the positive electrode end of the direct current power supply unit_f2One end of the load is connected with the negative end of the direct current power supply unit, and one end of the load is connected with the first filter capacitor C_f1And a second filter capacitor C_f2The other end of the load is grounded;

the filtering module includes: the bridge arm comprises a first class of filtering module and a second class of filtering module, wherein the first class of filtering module corresponds to a first class of bridge arm, and the second class of filtering module corresponds to a second class of bridge arm;

the input end of the first filtering module is connected with the output end of the first bridge arm, and the output end of the first filtering module is connected with the first filter capacitor C_f1And a second filter capacitorC_f2To (c) to (d);

the input end of the second type of filter module is connected with the output end of the second type of bridge arm, and the output end of the second type of filter module is connected with the first filter capacitor C_f1And a second filter capacitor C_f2In the meantime.

In this embodiment, the filtering module employs a filtering inductor L; the first-class resonance module adopts the 2i-1 filter inductor L to correspond to the first-class bridge arm and the first-class resonance module; the second type resonance module adopts the 2i filter inductor L to correspond to the second type bridge arm and the second type resonance module.

When the inverter circuit comprises a double-dropout half-bridge inverter, the soft-switching power amplifier is a half-bridge soft-switching power amplifier, as shown in fig. 3, and the filter network is composed of a filter inductor L₁,L₂First filter capacitor C_f1And a second filter capacitor C_f2Component, filter inductance L₁Is connected to the power switch device S₁Negative terminal of (1), filter inductor L₁Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2Between, filter inductance L₂Is connected to the power switch device S₂The positive terminal of (1), the filter inductor L₂Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); a first filter capacitor C_f1One end of the second filter capacitor C is connected with the positive electrode end of the direct current power supply unit_f2One end of which is connected to the negative terminal of the dc power supply unit.

When the inverter circuit comprises a plurality of parallel double-voltage-drop half-bridge inverters, the soft-switching power amplifier is a half-bridge parallel soft-switching power amplifier, as shown in fig. 2, and the filter network is composed of a filter inductor L₁,L₂,……,L_2i-1,L_2i,……,L_2N-1,L_2NFirst filter capacitor C_f1And a second filter capacitor C_f2And (4) forming. Filter inductance L₁Is connected to the power switch device S₁Negative terminal of (1), filter inductor L₁Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2Between, filter the electricityFeeling L₂Is connected to the power switch device S₂The positive terminal of (1), the filter inductor L₂Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L_2N-1Is connected to the power switch device S_2N-1Negative terminal of (1), filter inductor L_2N-1Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2Between, filter inductance L_2NIs connected to the power switch device S_2NThe positive terminal of (1), the filter inductor L_2NIs connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2In the meantime. Similarly, the filter inductor L_2i-1Is connected to the power switch device S_2i-1Negative terminal of (1), filter inductor L_2i-1Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2Between, filter inductance L_2iIs connected to the power switch device S_2iThe positive terminal of (1), the filter inductor L_2iIs connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2In the meantime. A first filter capacitor C_f1One end of the second filter capacitor C is connected with the positive electrode end of the direct current power supply unit_f2One end of which is connected to the negative terminal of the dc power supply unit.

In a preferred embodiment, the inverter circuit further includes at least one second type of half-bridge switching power unit, and the number of the second type of half-bridge switching power units is the same as that of the first type of half-bridge switching power units; the second type of half-bridge switching power units correspond to the first type of half-bridge switching power units one by one, and the first type of half-bridge switching power units and the corresponding second type of half-bridge switching power units are connected in parallel to form a double-voltage-drop full-bridge inverter;

the bridge arms also comprise a third class of bridge arms and a fourth class of bridge arms, and the third class of bridge arms and the fourth class of bridge arms are connected in parallel to form a second double-voltage-drop half-bridge inverter;

the positive end of the third type bridge arm is connected with the positive end of the direct-current power supply unit, and the negative end of the third type bridge arm is connected with the negative end of the direct-current power supply unit;

and the negative end of the fourth type bridge arm is connected with the positive end of the direct-current power supply unit, and the positive end of the fourth type bridge arm is connected with the negative end of the direct-current power supply unit.

In this embodiment, when the inverter circuit includes a full-bridge double-drop full-bridge inverter, the soft-switching power amplifier is a full-bridge soft-switching power amplifier. As shown in fig. 5, the half-bridge parallel inverter loop consists of a power switch device S₁,S₂,S₃,S₄Diode D₁,D₂,D₃,D₄And a resonance capacitor C_s1,C_s2,C_s3,C_s4And (4) forming. Power switch device S₁And diode D₁The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₂Positive terminal of (2) and diode D₂The anode ends of the two bridge arms are connected to form another bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S₃And diode D₃The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₄Positive terminal of (2) and diode D₄The anode ends of the two bridge arms are connected to form another bridge arm, the two bridge arms are connected in parallel to form a half bridge, and the two half bridges are connected in parallel to form the double step-down full-bridge inverter; resonant capacitor C_s1,C_s2,C_s3,C_s4Respectively in sequence with corresponding power switches S₁,S₂,S₃,S₄And (4) connecting in parallel.

When the inversion loop comprises a plurality of parallel full-bridge double-voltage-drop full-bridge inverters, the soft-switching power amplifier is a full-bridge parallel soft-switching power amplifier. As shown in FIG. 4, the full-bridge parallel inverter circuit is composed of a power switch device S₁,S₂,S₃,S₄,……,S_4i-3,S_4i-2,S_4i-1,S_4i,……,S_4N-3,S_4N-2,S_4N-1,S_4NDiode D₁,D₂,D₃,D₄,……,D_4i-3,D_4i-2,D_4i-1,D_4i,……,D_4N-3,D_4N-2,D_4N-1,D_4NAnd a resonance capacitor C_s1,C_s2,C_s3,C_s4,……,C_s4i-3,C_s4i-2,C_s4i-1,C_s4i,……,C_s4N-3,C_s4N-2,C_s4N-1,C_s4NAnd (4) forming. Power switch device S₁And diode D₁The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₂Positive terminal of (2) and diode D₂The anode ends of the two bridge arms are connected to form another bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S₃And diode D₃The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₄Positive terminal of (2) and diode D₄The anode ends of the two bridge arms are connected to form another bridge arm, the two bridge arms are connected in parallel to form a half bridge, and the two half bridges are connected in parallel to form the double step-down full-bridge inverter;

power switch device S_4N-3And diode D_4N-3The cathode end of the power switch is connected to form a shunt bridge arm_4N-2Positive terminal of (2) and diode D_4N-2The anode ends of the two bridge arms are connected to form another shunt bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S_4N-1And diode D_4N-1The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S_4NPositive terminal of (2) and diode D_4NThe anode ends of the two bridge arms are connected to form another bridge arm, the two bridge arms are connected in parallel to form a half bridge, and the two half bridges are connected in parallel to form the double step-down full-bridge inverter; the positive terminal of the double-buck multi-full-bridge inverter is connected to the positive terminal of the direct-current power supply, and the negative terminal of the double-buck multi-full-bridge inverter is connected to the negative terminal of the direct-current power supply. Resonant capacitor C_s1,C_s2,……,C_s4NRespectively in sequence with corresponding power switches S₁,S₂,……,S_4NAnd (4) connecting in parallel.

Similarly, the corresponding power switch device S_4i-3And diode D_4i-3The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S_4i-2Positive terminal of (2) and diode D_4i-2The anode ends of the two bridge arms are connected to form another bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S_4i-1Negative terminal and diodePipe D_4i-1The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S_4iPositive terminal of (2) and diode D_4iThe anode ends of the two half-bridges are connected to form another bridge arm, the two bridge arms are connected in parallel to form a half bridge, and the two half bridges are connected in parallel to form the double-buck full-bridge inverter.

In the above embodiment, the first class of bridge arm is a bridge arm composed of 4i-3 th power switch devices S and corresponding 4i-3 th diodes D, and the second class of bridge arm is a bridge arm composed of 4i-2 th power switch devices S and corresponding 4i-2 th diodes D; the third class of bridge arm is a bridge arm consisting of a 4i-1 th power switching device S and a corresponding 4i-1 th diode D, and the fourth class of bridge arm is a bridge arm consisting of a 4i power switching device S and a corresponding 4i diode D. Resonant capacitor C_s1,C_s2,C_s3,C_s4,……,C_s4N-3,C_s4N-2,C_s4N-1,C_s4NCan be an external capacitor or a power switch device S₁,S₂,S₃,S₄,……,S_4N-3,S_4N-2,S_4N-1,S_4NInternal parasitic capacitance.

In a preferred embodiment, the resonant network comprises a resonant capacitor formed by a first voltage-dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third voltage dividing capacitor C_d34N resonance circuits formed by 4N resonance modules, wherein the number of the resonance modules is the same as that of the bridge arms, and N is a positive integer;

the resonance module includes: the bridge arm comprises a first-class resonance module, a second-class resonance module, a third-class resonance module and a fourth-class resonance module, wherein the first-class resonance module corresponds to a first-class bridge arm, the second-class resonance module corresponds to a second-class bridge arm, the third-class resonance module corresponds to a third-class bridge arm, and the fourth-class resonance module corresponds to a fourth-class bridge arm;

the input end of the second type resonance module is connected with a second voltage division capacitor C_d2And a third partial capacitance C_d3The output end of the second type resonance module is connected with the output end of the second type bridge arm to form a resonance loop;

the input end of the third type resonance module is connected with the first voltage division capacitor C_d1And a second voltage dividing capacitor C_d2The output end of the third type resonance module is connected with the output end of the third type bridge arm to form a resonant loop;

the input end of the fourth type resonance module is connected with the second voltage division capacitor C_d2And a third partial capacitance C_d3And the output end of the fourth type resonance module is connected with the output end of the fourth type bridge arm to form a resonant loop.

In this embodiment, when the inverter circuit includes a full-bridge double-drop full-bridge inverter, the soft-switching power amplifier is a full-bridge soft-switching power amplifier. As shown in FIG. 5, power switch device S'₁Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₁Is connected to the resonant inductor L'₁One end of (1), resonant inductor L'₁Is connected at the other end to a diode D'₁Anode terminal of (1), diode D'₁Is connected to the power switch device S₁The negative terminal of (1); power switching device S'₂Is connected to the power switch device S₂Positive electrode terminal of (1), power switching device S'₂Is connected to the resonant inductor L'₂One end of (1), resonant inductor L'₂Is connected at the other end to a diode D'₂Anode terminal of (1), diode D'₂Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3Is connected toPoint-on; power switching device S'₃Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₃Is connected to the resonant inductor L'₃One end of (1), resonant inductor L'₃Is connected at the other end to a diode D'₃Anode terminal of (1), diode D'₃Is connected to the power switch device S₃The negative terminal of (1); power switching device S'₄Is connected to the power switch device S₄Positive electrode terminal of (1), power switching device S'₄Is connected to the resonant inductor L'₄One end of (1), resonant inductor L'₄Is connected at the other end to a diode D'₄Anode terminal of (1), diode D'₄Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a). Voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the DC power supply unit and a voltage-dividing capacitor C_d1One end of the voltage divider is connected with the positive end of the direct current power supply unit and the voltage dividing capacitor C_d3One end of which is connected to the negative terminal of the dc power supply unit.

When the inversion loop comprises a plurality of parallel full-bridge double-voltage-drop full-bridge inverters, the soft-switching power amplifier is a full-bridge parallel soft-switching power amplifier. As shown in FIG. 4, the resonant network is formed by a power switch device S'₁,S′₂,S′₃,S′₄,……,S′_4i-3,S′_4i-2,S′_4i-1,S′_4i,……,S′_4N-3,S′_4N-2,S′_4N-1,S′_4NDiode D'₁,D′₂,D′₃,D′₄,……,D′_4i-3,D′_4i-2,D′_4i-1,D′_4i,……,D′_4N-3,D′_4N-2,D′_4N-1,D′_4NResonant inductor L'₁,L′₂,L′₃,L′₄,……,L′_4i-3,L′_4i-2,L′_4i-1,L′_4i,……,L′_4N-3,L′_4N-2,L′_4N-1,L′_4NFirst voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3And (4) forming. Power switching device S'₁Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₁Is connected to the resonant inductor L'₁One end of (1), resonant inductor L'₁Is connected at the other end to a diode D'₁Anode terminal of (1), diode D'₁Is connected to the power switch device S₁The negative terminal of (1); power switching device S'₂Is connected to the power switch device S₂Positive electrode terminal of (1), power switching device S'₂Is connected to the resonant inductor L'₂One end of (1), resonant inductor L'₂Is connected at the other end to a diode D'₂Anode terminal of (1), diode D'₂Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'₃Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₃Is connected to the resonant inductor L'₃One end of (1), resonant inductor L'₃Is connected at the other end to a diode D'₃Anode terminal of (1), diode D'₃Is connected to the power switch device S₃The negative terminal of (1); power switching device S'₄Is connected to the power switch device S₄Positive electrode terminal of (1), power switching device S'₄Is connected to the resonant inductor L'₄One end of (1), resonant inductor L'₄Is connected at the other end to a diode D'₄Anode terminal of (1), diode D'₄Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a);

similarly, the corresponding power switch device S'_4i-3Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'_4i-3Is connected to the resonant inductor L'_4i-3One end of (1), resonant inductor L'_4i-3Is connected at the other end to a diode D'_4i-3Anode terminal of (1), diode D'_4i-3Is connected to the power switch device S_4i-3The negative terminal of (1); power switching device S'_4i-2Is connected to the power switch device S_4i--₂Positive electrode terminal of (1), power switching device S'_4i-2Is connected to the resonant inductor L'_4i-2One end of (1), resonant inductor L'_4i-2Is connected at the other end to a diode D'_4i-2Anode terminal of (1), diode D'_4i-2Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'_4i-1Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'_4i-1Is connected to the resonant inductor L'_4i-1One end of (1), resonant inductor L'_4i-1Is connected at the other end to a diode D'_4i-1Anode terminal of (1), diode D'_4i-1Is connected to the power switch device S_4i-1The negative terminal of (1); power switching device S'_4iIs connected to the power switch device S_4NPositive electrode terminal of (1), power switching device S'_4iIs connected to the resonant inductor L'_4iOne end of (1), resonant inductor L'_4iIs connected at the other end to a diode D'_4iAnode terminal of (1), diode D'_4iIs connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a).

Voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the DC power supply unit and a voltage-dividing capacitor C_d1One end of the voltage divider is connected with the positive end of the direct current power supply unit and the voltage dividing capacitor C_d3One end of which is connected to the negative terminal of the dc power supply unit.

In this embodiment, the first type of resonant module is a resonant module composed of a 4i-3 th power switch device S ', a corresponding 4i-3 th diode D ', and a corresponding 4i-3 th resonant inductor L '; the second type resonance module is a resonance module consisting of a 4i-2 power switch device S ', a corresponding 4i-2 diode D ' and a corresponding 4i-2 resonance inductor L '; the third type resonance module is a resonance module consisting of a 4i-1 th power switch device S ', a corresponding 4i-1 th diode D ' and a corresponding 4i-1 th resonance inductor L '; the fourth type resonance module is a fourth type resonance module consisting of a 4i power switch device S ', a corresponding 4i diode D ' and a corresponding 4i resonance inductor L '.

In a preferred embodiment, the filter network comprises a first filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3A fourth filter capacitor C_f44N filtering loops formed by 4N filtering modules, wherein the number of the filtering modules is the same as that of the bridge arms, and N is a positive integer;

a first filter capacitor C_f1And a second filter capacitor C_f2A first filter capacitor C connected in series with two ends of the DC power supply unit_f1One end of the second filter capacitor C is connected with the positive electrode end of the direct current power supply unit_f2One end of the load is connected with the negative end of the direct current power supply unit, and one end of the load is connected with the first filter capacitor C_f1And a second filter capacitor C_f2To (c) to (d);

third filter capacitor C_f3And a fourth filter capacitor C_f4A third filter capacitor C connected in series with two ends of the DC power supply unit_f3Is connected with the positive terminal of the direct current power supply unit, and a fourth filter capacitor C_f4One end of the load is connected with the negative end of the direct current power supply unit, and the other end of the load is connected with the third filter capacitor C_f3And a fourth filter capacitor C_f4To (c) to (d);

the filtering module includes: the bridge arm structure comprises a first type of filtering module, a second type of filtering module, a third type of filtering module and a fourth type of filtering module, wherein the first type of filtering module corresponds to a first type of bridge arm, the second type of filtering module corresponds to a second type of bridge arm, the third type of filtering module corresponds to a third type of bridge arm, and the fourth type of filtering module corresponds to a fourth type of bridge arm;

first class filterThe input end of the wave module is connected with the output end of the first bridge arm, and the output end of the first filtering module is connected with the first filtering capacitor C_f1And a second filter capacitor C_f2To (c) to (d);

the input end of the second type of filter module is connected with the output end of the second type of bridge arm, and the output end of the second type of filter module is connected with the first filter capacitor C_f1And a second filter capacitor C_f2To (c) to (d);

the input end of the third type of filter module is connected with the output end of the third type of bridge arm, and the output end of the third type of filter module is connected with the third filter capacitor C_f3And a fourth filter capacitor C_f4To (c) to (d);

the input end of the fourth type of filter module is connected with the output end of the fourth type of bridge arm, and the output end of the fourth type of filter module is connected with the third filter capacitor C_f3And a fourth filter capacitor C_f4In the meantime.

In this embodiment, when the inverter circuit includes a full-bridge double-drop full-bridge inverter, the soft-switching power amplifier is a full-bridge soft-switching power amplifier. As shown in fig. 5, the filter network is composed of a filter inductor L₁,L₂,L₃,L₄First filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3And a fourth filter capacitor C_f4And (4) forming. Filter inductance L₁Is connected to the power switch device S₁Negative terminal of (1), filter inductor L₁Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L₂Is connected to the power switch device S₂The positive terminal of (1), the filter inductor L₂Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L₃Is connected to the power switch device S₃Negative terminal of (1), filter inductor L₃Is connected to the first filter capacitor C at the other end_f3And a second filter capacitor C_f4To (c) to (d); filter inductance L₄Is connected to the power switch device S₄The positive terminal of (1), the filter inductor L₄Is connected to the first filter at the other endWave capacitor C_f3And a second filter capacitor C_f4To (c) to (d); third filter capacitor C_f3And a fourth filter capacitor C_f4A third filter capacitor C connected in series with two ends of the DC power supply unit_f3Is connected with the positive terminal of the direct current power supply unit, and a fourth filter capacitor C_f4One end of the load is connected with the negative end of the direct current power supply unit, and the other end of the load is connected with the third filter capacitor C_f3And a fourth filter capacitor C_f4In the meantime.

When the inversion loop comprises a plurality of parallel full-bridge double-voltage-drop full-bridge inverters, the soft-switching power amplifier is a full-bridge parallel soft-switching power amplifier. As shown in fig. 4, the filter network is composed of a filter inductor L₁,L₂,L₃,L₄,……,L_4i-3,L_4i-2,L_4i-1,L_4i,……,L_4N-3,L_4N-2,L_4N-1,L_4NFirst filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3And a fourth filter capacitor C_f4And (4) forming.

The filtering module adopts a filtering inductor L; the first-class resonance module adopts 4i-3 filter inductors L to correspond to the first-class bridge arm and the first-class resonance module; the second type resonance module adopts a 4i-2 filter inductor L to correspond to the second type bridge arm and the second type resonance module; the third type resonance module adopts a 4i-1 filter inductor L to correspond to the third type bridge arm and the third type resonance module; the fourth type resonance module adopts a 4i filter inductor L to correspond to the fourth type bridge arm and the fourth type resonance module. The 4i-3 filter inductor L and the 4i filter inductor L can be wound on a magnetic core at the same time; the 4i-2 filter inductor L and the 4i-1 filter inductor L can be wound on one magnetic core at the same time.

When the inversion loop comprises a plurality of parallel full-bridge double-voltage-drop full-bridge inverters, the soft-switching power amplifier is a full-bridge parallel soft-switching power amplifier. As shown in fig. 4, the filter network is composed of a filter inductor L₁,L₂,L₃,L₄,……,L_4i-3,L_4i-2,L_4i-1,L_4i,……,L_4N-3,L_4N-2,L_4N-1,L_4NFirst filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3And a fourth filter capacitor C_f4And (4) forming. Filter inductance L₁Is connected to the power switch device S₁Negative terminal of (1), filter inductor L₁Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L₂Is connected to the power switch device S₂The positive terminal of (1), the filter inductor L₂Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L₃Is connected to the power switch device S₃Negative terminal of (1), filter inductor L₃Is connected to the first filter capacitor C at the other end_f3And a second filter capacitor C_f4To (c) to (d); filter inductance L₄Is connected to the power switch device S₄The positive terminal of (1), the filter inductor L₄Is connected to the first filter capacitor C at the other end_f3And a second filter capacitor C_f4In the meantime.

In the same way, the corresponding filter inductor L_4i-3Is connected to the power switch device S_4i-3Negative terminal of (1), filter inductor L_4i-3Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L_4i-2Is connected to the power switch device S_4i-2The positive terminal of (1), the filter inductor L_4i-2Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L_4i-1Is connected to the power switch device S_4i-1Negative terminal of (1), filter inductor L_4i-1Is connected to the first filter capacitor C at the other end_f3And a second filter capacitor C_f4To (c) to (d); filter inductance L_4iIs connected to the power switch device S_4iThe positive terminal of (1), the filter inductor L_4iIs connected to the first filter capacitor C at the other end_f3And a second filter capacitor C_f4In the meantime.

A first filter capacitor C_f3One end of which is connected with direct currentThe positive terminal of the source unit, and a second filter capacitor C_f4One end of which is connected to the negative terminal of the dc power supply unit.

In a preferred embodiment, the inverter circuit further includes at least one third type of half-bridge switching power unit, and the number of the third type of half-bridge switching power unit is the same as the number of the first type of half-bridge switching power unit and the number of the second type of half-bridge switching power unit; the third type of half-bridge switching power unit corresponds to the first type of half-bridge switching power unit and the second type of half-bridge switching power unit one by one, and the third type of half-bridge switching power unit is connected with the corresponding first type of half-bridge switching power unit and the corresponding second type of half-bridge switching power unit in parallel to form a three-phase double-voltage-drop full-bridge inverter;

the bridge arms also comprise a fifth type of bridge arm and a sixth type of bridge arm, and the fifth type of bridge arm and the sixth type of bridge arm are connected in parallel to form a third type of double-voltage-drop half-bridge inverter;

the positive end of the fifth type bridge arm is connected with the positive end of the direct-current power supply unit, and the negative end of the fifth type bridge arm is connected with the negative end of the direct-current power supply unit;

and the negative end of the sixth type bridge arm is connected with the positive end of the direct-current power supply unit, and the positive end of the sixth type bridge arm is connected with the negative end of the direct-current power supply unit.

In this embodiment, when the inverter circuit includes a three-phase dual-drop full-bridge inverter, the soft-switching power amplifier is a three-phase full-bridge soft-switching power amplifier. As shown in FIG. 7, the three-phase full-bridge parallel inverse-conversion loop is composed of a power switch device S₁,S₂,S₃,S₄,S₅,S₆Diode D₁,D₂,D₃,D₄,D₅,D₆And a resonance capacitor C_s1,C_s2,C_s3,C_s4,C_s5,C_s6And (4) forming. Power switch device S₁And diode D₁The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₂Positive terminal of (2) and diode D₂The anode ends of the two bridge arms are connected to form another bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S₃And diode D₃Of a cathodeThe ends are connected to form a bridge arm, a power switch device S₄Positive terminal of (2) and diode D₄The anode ends of the two bridge arms are connected to form another bridge arm; power switch device S₅And diode D₅The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₆Positive terminal of (2) and diode D₆The anode ends of the three half bridges are connected in parallel to form another bridge arm, the two bridge arms are connected in parallel to form another half bridge, and the three half bridges are connected in parallel to form the three-phase double-buck full-bridge inverter. The positive terminal of the three-phase double-buck full-bridge inverter is connected to the positive terminal of the direct-current power supply, and the negative terminal of the three-phase double-buck full-bridge inverter is connected to the negative terminal of the direct-current power supply. Resonant capacitor C_s1,C_s2,……,C_s6Respectively in sequence with corresponding power switches S₁,S₂,……,S₆And (4) connecting in parallel.

When the inversion loop comprises a plurality of three-phase double-voltage-drop full-bridge inverters which are connected in parallel, the soft-switching power amplifier is a three-phase full-bridge parallel soft-switching power amplifier. As shown in FIG. 6, the three-phase full-bridge parallel inverse-conversion loop is composed of a power switch device S₁,S₂,S₃,S₄,S₅,S₆,……,S_6i-5,S_6i-4,S_6i-3,S_6i-2,S_6i-1,S_6i,……,S_6N-5,S_6N-4,S_6N-3,S_6N-2,S_6N-1,S_6NDiode D₁,D₂,D₃,D₄,D₅,D₆,……,D_6i-5,D_6i-4,D_6i-3,D_6i-2,D_6i-1,D_6i,……,D_6N-5,D_6N-4,D_6N-3,D_6N-2,D_6N-1,D_6NAnd a resonance capacitor C_s1,C_s2,C_s3,C_s4,C_s5,C_s6,……,C_s6i-5,C_s6i-4,C_s6i-3,C_s6i-2,C_s6i-1,C_s6i,……,C_s6N-5,C_s6N-4,C_s6N-3,C_s6N-2,C_s6N-1,C_s6NAnd (4) forming. Power switch device S₁And diode D₁Is connected to form a cathode terminalBridge arm, power switch device S₂Positive terminal of (2) and diode D₂The anode ends of the two bridge arms are connected to form another bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S₃And diode D₃The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₄Positive terminal of (2) and diode D₄The anode ends of the two bridge arms are connected to form another bridge arm; power switch device S₅And diode D₅The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S₆Positive terminal of (2) and diode D₆The anode ends of the three half bridges are connected to form another bridge arm, the two bridge arms are connected in parallel to form another half bridge, and the three half bridges are connected in parallel to form the three-phase double-buck full-bridge inverter;

similarly, the corresponding power switch device S_6i-5And diode D_6i-5The cathode end of the power switch is connected to form a shunt bridge arm_6i-4Positive terminal of (2) and diode D_6i-4The anode ends of the two bridge arms are connected to form another shunt bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S_6i-3And diode D_6i-3The cathode end of the power switch is connected to form a shunt bridge arm_6i-2Positive terminal of (2) and diode D_6i-2The anode ends of the two bridge arms are connected to form another shunt bridge arm, and the two bridge arms are connected in parallel to form a half bridge; power switch device S_6i-1And diode D_6i-1The cathode terminals of the two bridge arms are connected to form a bridge arm, and the power switch device S_6iPositive terminal of (2) and diode D_6iThe anode ends of the three half bridges are connected in parallel to form a three-phase double-step-down full-bridge inverter; (ii) a The half-bridges of the three-phase double-buck full-bridge inverters are connected in parallel to form a three-phase double-buck multi-full-bridge inverter, the positive terminal of the three-phase double-buck multi-full-bridge inverter is connected to the positive terminal of the direct-current power supply, and the negative terminal of the three-phase double-buck full-bridge inverter is connected to the negative terminal of. Resonant capacitor C_s1,C_s2,……,C_s6NRespectively in sequence with corresponding power switches S₁,S₂,……,S_6NAnd (4) connecting in parallel.

In the above embodiment, the first bridge arm is a bridge arm composed of the 6i-5 th power switch device S and the corresponding 6i-5 th diode D, and the second bridge arm is a bridge arm composed of the 6i-4 th power switch device S and the corresponding 6i-4 th diode D; the third class of bridge arm is a bridge arm consisting of a 6i-3 th power switch device S and a corresponding 6i-3 th diode D, and the fourth class of bridge arm is a bridge arm consisting of a 6i-2 th power switch device S and a corresponding 6i-2 th diode D; the fifth type of bridge arm is a bridge arm consisting of a 6i-1 th power switching device S and a corresponding 6i-1 th diode D, and the sixth type of bridge arm is a bridge arm consisting of a 6 i-th power switching device S and a corresponding 6 i-th diode D. Resonant capacitor C_s1,C_s2,C_s3,C_s4,C_s5,C_s6,……,C_s6N-5,C_s6N-4,C_s6N-3,C_s6N-2,C_s6N-1,C_s6NCan be an external capacitor or a power switch device S₁,S₂,S₃,S₄,S₅,S₆,……,S_6N-5,S_6N-4,S_6N-3,S_6N-2,S_6N-1,S_6NInternal parasitic capacitance.

In a preferred embodiment, the resonant network comprises a resonant capacitor formed by a first voltage-dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third voltage dividing capacitor C_d36N resonance circuits formed by 6N resonance modules, wherein the number of the resonance modules is the same as that of the bridge arms, and N is a positive integer;

the resonance module includes: the bridge arm structure comprises a first-class resonance module, a second-class resonance module, a third-class resonance module, a fourth-class resonance module, a fifth-class resonance module and a sixth-class resonance module, wherein the first-class resonance module corresponds to a first-class bridge arm, the second-class resonance module corresponds to a second-class bridge arm, the third-class resonance module corresponds to a third-class bridge arm, the fourth-class resonance module corresponds to a fourth-class bridge arm, the fifth-class resonance module corresponds to a fifth-class bridge arm, and the sixth-class resonance module corresponds to a sixth-class bridge arm;

the input end of the fourth type resonance module is connected with the second voltage division capacitor C_d2And a third partial capacitance C_d3The output end of the fourth type resonance module is connected with the output end of the fourth type bridge arm to form a resonant loop;

the input end of the fifth type resonance module is connected with the first voltage division capacitor C_d1And a second voltage dividing capacitor C_d2The output end of the fifth type resonance module is connected with the output end of the fifth type bridge arm to form a resonance loop;

the input end of the sixth resonant module is connected with the second voltage dividing capacitor C_d2And a third partial capacitance C_d3And the output end of the sixth type resonance module is connected with the output end of the sixth type bridge arm to form a resonant loop.

In this embodiment, when the inverter circuit includes a three-phase dual-drop full-bridge inverter, the soft-switching power amplifier is a three-phase full-bridge parallel soft-switching power amplifier. As shown in FIG. 7, the resonant network is formed by a power switch device S'₁,S′₂,S′₃,S′₄,S′₅,S′₆Diode D'₁,D′₂,D′₃,D′₄,D′₅,D′₆Resonant inductor L'₁,L′₂,L′₃,L′₄,L′₅,L′₆First voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3And (4) forming. Power switching device S'₁Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₁Is connected to the resonant inductor L'₁One end of (1), resonant inductor L'₁Is connected at the other end to a diode D'₁Anode terminal of (1), diode D'₁Is connected to the power switch device S₁The negative terminal of (1); power switching device S'₂Is connected to the power switch device S₂Positive electrode terminal of (1), power switching device S'₂Is connected to the resonant inductor L'₂One end of (1), resonant inductor L'₂Is connected at the other end to a diode D'₂Anode terminal of (1), diode D'₂Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'₃Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₃Is connected to the resonant inductor L'₃One end of (1), resonant inductor L'₃Is connected at the other end to a diode D'₃Anode terminal of (1), diode D'₃Is connected to the power switch device S₃The negative terminal of (1); power switching device S'₄Is connected to the power switch device S₄Positive electrode terminal of (1), power switching device S'₄Is connected to the resonant inductor L'₄One end of (1), resonant inductor L'₄Is connected at the other end to a diode D'₄Anode terminal of (1), diode D'₄Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'₅Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₅Is connected to the resonant inductor L'₅One end of (1), resonant inductor L'₅Is connected at the other end to a diode D'₅Anode terminal of (1), diode D'₅Is connected to the power switch device S₅The negative terminal of (1); power switching device S'₆Is connected to the power switch device S₆Positive electrode terminal of (1), power switching device S'₆Is connected to the resonant inductor L'₆One end of (1), resonant inductor L'₆Is connected at the other end to a diode D'₆Anode terminal of (1), diode D'₆Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the DC power supply unit and a voltage-dividing capacitor C_d1One end of the voltage divider is connected with the positive end of the direct current power supply unit and the voltage dividing capacitor C_d3One end of which is connected to the negative terminal of the dc power supply unit.

When the inversion loop comprises a plurality of three-phase double-voltage-drop full-bridge inverters which are connected in parallel, the soft-switching power amplifier is a three-phase full-bridge parallel soft-switching power amplifier. As shown in FIG. 6, the resonant network is formed by a power switch device S'₁,S′₂,S′₃,S′₄,S′₅,S′₆,……,S′_6i-5,S′_6i-4,S′_6i-3,S′_6i-2,S′_6i-1,S′_6i,……,S′_6N-5,S′_6N-4,S′_6N-3,S′_6N-2,S′_6N-1,S′_6NDiode D'₁,D′₂,D′₃,D′₄,D′₅,D′₆,……,D′_6i-5,D′_6i-4,D′_6i-3,D′_6i-2,D′_6i-1,D′_6i,……,D′_6N-5,D′_6N-4,D′_6N-3,D′_6N-2,D′_6N-1,D′_6NResonant inductor L'₁,L′₂,L′₃,L′₄,L′₅,L′₆,……,L′_6i-5,L′_6i-4,L′_6i-3,L′_6i-2,L′_6i-1,L′_6i,……,L′_6N-5,L′_6N-4,L′_6N-3,L′_6N-2,L′_6N-1,L′_6NFirst voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3And (4) forming.

Power switching device S'₁Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₁Is connected to the resonant inductor L'₁One end of (1), resonant inductor L'₁Is connected at the other end to a diode D'₁Anode terminal of (1), diode D'₁Is connected to the power switch device S₁The negative terminal of (1); power switching device S'₂Is connected to the power switch device S₂Positive electrode terminal of (1), power switching device S'₂Is connected to the resonant inductor L'₂One end of (1), resonant inductor L'₂Is connected at the other end to a diode D'₂Anode terminal of (1), diode D'₂Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'₃Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₃Is connected to the resonant inductor L'₃One end of (1), resonant inductor L'₃Is connected at the other end to a diode D'₃Anode terminal of (1), diode D'₃Is connected to the power switch device S₃The negative terminal of (1); power switching device S'₄Is connected to the power switch device S₄Positive electrode terminal of (1), power switching device S'₄Is connected to the resonant inductor L'₄One end of (1), resonant inductor L'₄Is connected at the other end to a diode D'₄Anode terminal of (1), diode D'₄Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'₅Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'₅Is connected to the resonant inductor L'₅One end of (1), resonant inductor L'₅Is connected at the other end to a diode D'₅Anode terminal of (1), diode D'₅Is connected to the power switch device S₅The negative terminal of (1); power switching device S'₆Is connected to the power switch device S₆Positive electrode terminal of (1), power switching device S'₆Is connected to the resonant inductor L'₆One end of (1), resonant inductor L'₆Is connected at the other end to a diode D'₆Anode terminal of (1), diode D'₆Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a);

similarly, the corresponding power switch device S'_6i-5Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'_6i-5Is connected to the resonant inductor L'_6i-5One end of (1), resonant inductor L'_6i-5Is connected at the other end to a diode D'_6i-5Anode terminal of (1), diode D'_6i-5Is connected to the power switch device S_6i-5The negative terminal of (1); power switching device S'_6i-4Is connected to the power switch device S_6i-4Positive electrode terminal of (1), power switching device S'_6i-4Is connected to the resonant inductor L'_6i-4One end of (1), resonant inductor L'_6i-4Is connected at the other end to a diode D'_6i-4Anode terminal of (1), diode D'_6i-4Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'_6i-3Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'_6i-3Is connected to the resonant inductor L'_6i-3One end of (1), resonant inductor L'_6i-3Is connected at the other end to a diode D'_6i-3Anode terminal of (1), diode D'_6i-3Is connected to the power switch device S_6i-3The negative terminal of (1); power switching device S'_6i-2Is connected to the power switch device S_6i-2Positive electrode terminal of (1), power switching device S'_6i-2Is connected to the resonant inductor L'_6i-2One end of (1), resonant inductor L'_6i-2Is connected at the other end to a diode D'_6i-2Anode terminal of (1), diode D'_6i-2Is connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); power switching device S'_6i-1Is connected to the first voltage-dividing capacitor C_d1And a second voltage dividing capacitor C_d2At the connection point of (2), a power switch device S'_6i-1Is connected to the resonant inductor L'_6i-1One end of (1), resonant inductor L'_6i-1Is connected at the other end to a diode D'_6i-1Anode terminal of (1), diode D'_6i-1Is connected to the power switch device S_6i-1The negative terminal of (1); power switching device S'_6iIs connected to the power switch device S_6iPositive electrode terminal of (1), power switching device S'_6iIs connected to the resonant inductor L'_6iOne end of (1), resonant inductor L'_6iIs connected at the other end to a diode D'_6iAnode terminal of (1), diode D'_6iIs connected to a second voltage dividing capacitor C_d2And a third partial capacitance C_d3On the connection point of (a); voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the DC power supply unit and a voltage-dividing capacitor C_d1One end of the voltage divider is connected with the positive end of the direct current power supply unit and the voltage dividing capacitor C_d3One end of which is connected to the negative terminal of the dc power supply unit.

In this embodiment, the first type of resonant module is a resonant module composed of a 6i-5 th power switch device S ', a corresponding 6i-5 th diode D ', and a corresponding 6i-5 th resonant inductor L '; the second type resonance module is a resonance module consisting of a 6i-4 th power switch device S ', a corresponding 6i-4 th diode D ' and a corresponding 6i-4 th resonance inductor L '; the third type resonance module is a resonance module consisting of a 6i-3 th power switch device S ', a corresponding 6i-3 th diode D ' and a corresponding 6i-3 th resonance inductor L '; the fourth type resonance module is a resonance module consisting of a 6i-2 th power switch device S ', a corresponding 6i-2 th diode D ' and a corresponding 6i-2 th resonance inductor L '; the fifth type resonance module is a resonance module consisting of a 6i-1 th power switch device S ', a corresponding 6i-1 th diode D ' and a corresponding 6i-1 th resonance inductor L '; the sixth type resonance module is a resonance module consisting of a 6i th power switch device S ', a corresponding 6i th diode D ' and a corresponding 6i th resonance inductor L '.

The power switch device may be a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), a power Transistor (GTR), or an Insulated Gate Bipolar Transistor (IGBT).

In a preferred embodiment, the filter network comprises a first filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3A fourth filter capacitor C_f4A fifth filter capacitor C_f5A sixth filter capacitor C_f66N filtering loops formed by 6N filtering modules, wherein the number of the filtering modules is the same as that of the bridge arms, and N is a positive integer;

third filter capacitor C_f3And a fourth filter capacitor C_f4A third filter capacitor C connected in series with two ends of the DC power supply unit_f3Is connected to one end ofThe positive end of the direct-current power supply unit is connected with a fourth filter capacitor C_f4One end of the load is connected with the negative end of the direct current power supply unit, and the other end of the load is connected with the third filter capacitor C_f3And a fourth filter capacitor C_f4To (c) to (d);

fifth filter capacitor C_f5And a sixth filter capacitor C_f6A fifth filter capacitor C connected in series with two ends of the DC power supply unit_f5Is connected with the positive terminal of the direct current power supply unit, and a sixth filter capacitor C_f6One end of the load is connected with the negative end of the direct current power supply unit, and the other end of the load is connected with the fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d);

the filtering module includes: the bridge arm bridge comprises a first type of filtering module, a second type of filtering module, a third type of filtering module, a fourth type of filtering module, a fifth type of filtering module and a sixth type of filtering module, wherein the first type of filtering module corresponds to a first type of bridge arm, the second type of filtering module corresponds to a second type of bridge arm, the third type of filtering module corresponds to a third type of bridge arm, the fourth type of filtering module corresponds to a fourth type of bridge arm, the fifth type of filtering module corresponds to a fifth type of bridge arm, and the sixth type of filtering module corresponds to a sixth type of bridge arm;

the input end of the first filtering module is connected with the output end of the first bridge arm, and the output end of the first filtering module is connected with the first filter capacitor C_f1And a second filter capacitor C_f2To (c) to (d);

the input end of the second type of filter module is connected with the output end of the second type of bridge arm, and the output end of the second type of filter module is connected with the fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d);

the input end of the fourth type of filter module is connected with the output end of the fourth type of bridge arm, and the output end of the fourth type of filter module is connected with the first filter capacitor C_f1And a second filter capacitor C_f2To (c) to (d);

class five filtersThe input end of the wave module is connected with the output end of the fifth bridge arm, and the output end of the fifth filter module is connected with the fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d);

the input end of the sixth filtering module is connected with the output end of the sixth bridge arm, and the output end of the sixth filtering module is connected with the third filtering capacitor C_f3And a fourth filter capacitor C_f4In the meantime.

In this embodiment, when the inverter circuit includes a plurality of three-phase double-drop full-bridge inverters connected in parallel, the soft-switching power amplifier is a three-phase full-bridge parallel soft-switching power amplifier. As shown in fig. 7, the filter network is composed of a filter inductor L₁,L₂,L₃,L₄,L₅,L₆First filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3And a fourth filter capacitor C_f4A third filter capacitor C_f5And a fourth filter capacitor C_f6And (4) forming. Filter inductance L₁Is connected to the power switch device S₁Negative terminal of (1), filter inductor L₁Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2Between, filter inductance L₂Is connected to the power switch device S₂The positive terminal of (1), the filter inductor L₂Is connected at the other end to a fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d); filter inductance L₃Is connected to the power switch device S₃Negative terminal of (1), filter inductor L₃Is connected at the other end to a third filter capacitor C_f3And a fourth filter capacitor C_f4Between, filter inductance L₄Is connected to the power switch device S₄The positive terminal of (1), the filter inductor L₄Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L₅Is connected to the power switch device S₅Negative terminal of (1), filter inductor L₅Is connected at the other end to a fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d); filter inductance L₆Is connected to power at one endSwitching device S₆The positive terminal of (1), the filter inductor L₆Is connected at the other end to a third filter capacitor C_f3And a fourth filter capacitor C_f4In the meantime.

When the inversion loop comprises a plurality of three-phase double-voltage-drop full-bridge inverters which are connected in parallel, the soft-switching power amplifier is a three-phase full-bridge parallel soft-switching power amplifier. As shown in fig. 6, the filter network is composed of a filter inductor L₁,L₂,L₃,L₄,L₅,L₆,……,L_6i-5,L_6i-4,L_6i-3,L_6i-2,L_6i-1,L_6i,……L_6N-5,L_6N-4,L_6N-3,L_6N-2,L_6N-1,L_6NFirst filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3And a fourth filter capacitor C_f4A third filter capacitor C_f5And a fourth filter capacitor C_f6And (4) forming. The filtering module adopts a filtering inductor L; the first-class resonance module adopts a 6i-5 th filter inductor L to correspond to the first-class bridge arm and the first-class resonance module; the second type resonance module adopts a 6i-4 filter inductor L to correspond to the second type bridge arm and the second type resonance module; the third type resonance module adopts 6i-3 filter inductors L to correspond to the third type bridge arm and the third type resonance module; the fourth type resonance module adopts a 6i-2 filter inductor L to correspond to the fourth type bridge arm and the fourth type resonance module; the fifth type resonance module adopts a 6i-1 filter inductor L to correspond to the fifth type bridge arm and the fifth type resonance module; the sixth type resonance module adopts the 6 i-th filter inductor L to correspond to the sixth type bridge arm and the sixth type resonance module.

Filter inductance L₁Is connected to the power switch device S₁Negative terminal of (1), filter inductor L₁Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2Between, filter inductance L₂Is connected to the power switch device S₂The positive terminal of (1), the filter inductor L₂Is connected at the other end to a fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d); filter inductance L₃Is connected to the power switch device S₃Negative terminal of (1), filter inductor L₃Is connected at the other end to a third filter capacitor C_f3And a fourth filter capacitor C_f4Between, filter inductance L₄Is connected to the power switch device S₄The positive terminal of (1), the filter inductor L₄Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L₅Is connected to the power switch device S₅Negative terminal of (1), filter inductor L₅Is connected at the other end to a fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d); filter inductance L₆Is connected to the power switch device S₆The positive terminal of (1), the filter inductor L₆Is connected at the other end to a third filter capacitor C_f3And a fourth filter capacitor C_f4To (c) to (d);

in the same way, the corresponding filter inductor L_6i-5Is connected to the power switch device S_6i-5Negative terminal of (1), filter inductor L_6i-5Is connected at the other end to a third filter capacitor C_f3And a fourth filter capacitor C_f4To (c) to (d); filter inductance L_6i-4Is connected to the power switch device S_6i-4The positive terminal of (1), the filter inductor L_6i-4Is connected at the other end to a fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d); filter inductance L_6i-3Is connected to the power switch device S_6i-3Negative terminal of (1), filter inductor L_6i-3Is connected at the other end to a third filter capacitor C_f3And a fourth filter capacitor C_f4To (c) to (d); filter inductance L_6i-2Is connected to the power switch device S_6i-2The positive terminal of (1), the filter inductor L_6i-2Is connected to the first filter capacitor C at the other end_f1And a second filter capacitor C_f2To (c) to (d); filter inductance L_6i-1Is connected to the power switch device S_6i-1Negative terminal of (1), filter inductor L_6i-1Is connected to a fifth wave capacitor C at the other end_f5And a sixth filter capacitor C_f6To (c) to (d); filter inductance L_6iIs connected to the power switch device S_6iThe positive terminal of (1), the filter inductor L_6iIs connected at the other end to a third filter capacitor C_f3And a fourth filter capacitor C_f4In the meantime.

A first filter capacitor C_f1One end of the second filter capacitor C is connected with the positive electrode end of the direct current power supply unit_f2One end of which is connected to the negative terminal of the dc power supply unit. Third filter capacitor C_f3Is connected with the positive terminal of the direct current power supply unit, and a fourth filter capacitor C_f4One end of which is connected to the negative terminal of the dc power supply unit. Fifth filter capacitor C_f5Is connected with the positive terminal of the direct current power supply unit, and a sixth filter capacitor C_f6One end of which is connected to the negative terminal of the dc power supply unit.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative 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 features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims

1. A soft-switched power amplifier, comprising: the system comprises a direct-current power supply unit, an inverter loop, a resonant network and a filter network;

the inverter loop is used for converting the direct current output by the direct current power supply unit into alternating current and transmitting the alternating current to a load through the filter network;

the inverter circuit comprises at least one first-type half-bridge switching power unit, each first-type half-bridge switching power unit comprises a first-type double-voltage-drop half-bridge inverter consisting of two parallel bridge arms, and when a plurality of first-type half-bridge switching power units are arranged, the first-type half-bridge switching power units are connected in parallel;

the bridge arms comprise a first class of bridge arms and a second class of bridge arms, and the first class of bridge arms and the second class of bridge arms are connected in parallel to form a first class of double-voltage-drop half-bridge inverter;

the negative end of the second type bridge arm is connected with the positive end of the direct-current power supply unit, and the positive end of the second type bridge arm is connected with the negative end of the direct-current power supply unit;

characterized in that the resonant network comprises a first voltage dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third voltage dividing capacitor C_d3And 2N resonance circuits formed by 2N resonance modules, wherein the number of the resonance modules is the same as that of the bridge arms, and N is a positive integer;

the first voltage-dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the direct current power supply unit, and the first voltage division capacitor C_d1Is connected with the positive terminal of the DC power supply unit, and the third voltage dividing capacitor C_d3One end of the second switch is connected with the negative end of the direct current power supply unit;

the input end of the first-class resonance module is connected with the first voltage division capacitor C_d1And a second voltage dividing capacitor C_d2The output end of the first type resonance module is connected with the output end of the first type bridge arm to form a resonant loop;

the input end of the second type resonance module is connected with the second voltage division capacitor C_d2And a third partial capacitance C_d3Between the output end of the second type resonance module and the output of the second type bridge armThe ends are connected to form one path of the resonant loop.

2. The soft-switched power amplifier of claim 1, wherein the filter network comprises a first filter capacitor C_f1A second filter capacitor C_f2And 2N filtering loops formed by 2N filtering modules, wherein the number of the filtering modules is the same as that of the bridge arms, and N is a positive integer;

the first filter capacitor C_f1And a second filter capacitor C_f2Connected in series to two ends of the DC power supply unit, and the first filter capacitor C_f1Is connected with the positive terminal of the DC power supply unit, and the second filter capacitor C_f2Is connected to the negative terminal of the dc power supply unit, and one end of the load is connected to the first filter capacitor C_f1And a second filter capacitor C_f2The other end of the load is grounded;

the filtering module includes: the first type of filtering module corresponds to the first type of bridge arm, and the second type of filtering module corresponds to the second type of bridge arm;

the input end of the first type of filter module is connected with the output end of the first type of bridge arm, and the output end of the first type of filter module is connected with the first filter capacitor C_f1And a second filter capacitor C_f2To (c) to (d);

3. A soft-switched power amplifier, characterized in that,

the method comprises the following steps: the system comprises a direct-current power supply unit, an inverter loop, a resonant network and a filter network;

the resonant network comprises a first voltage-dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third voltage dividing capacitor C_d3The number of the resonance modules is the same as that of the bridge arms, wherein N is a positive integer;

the inverter loop further comprises at least one second type half-bridge switching power unit, and the number of the second type half-bridge switching power units is the same as that of the first type half-bridge switching power units; the second type of half-bridge switching power units correspond to the first type of half-bridge switching power units one by one, and the first type of half-bridge switching power units and the corresponding second type of half-bridge switching power units are connected in parallel to form a double-voltage-drop full-bridge inverter;

the bridge arms also comprise a third class of bridge arms and a fourth class of bridge arms, and the third class of bridge arms and the fourth class of bridge arms are connected in parallel to form a second class of double-voltage-drop half-bridge inverter;

the negative end of the fourth type bridge arm is connected with the positive end of the direct-current power supply unit, and the positive end of the fourth type bridge arm is connected with the negative end of the direct-current power supply unit;

the negative end of the second type bridge arm is connected with the positive end of the direct-current power supply unit, and the positive end of the second type bridge arm is connected with the negative end of the direct-current power supply unit; the first voltage-dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third partial capacitance C_d3Are sequentially connected in series at two ends of the direct current power supply unit, and the first voltage division capacitor C_d1Is connected with the positive terminal of the DC power supply unit, and the third voltage dividing capacitor C_d3One end of the second switch is connected with the negative end of the direct current power supply unit;

the resonance module includes: the bridge arm comprises a first-class resonance module, a second-class resonance module, a third-class resonance module and a fourth-class resonance module, wherein the first-class resonance module corresponds to the first-class bridge arm, the second-class resonance module corresponds to the second-class bridge arm, the third-class resonance module corresponds to the third-class bridge arm, and the fourth-class resonance module corresponds to the fourth-class bridge arm;

the input end of the second type resonance module is connected with the second voltage division capacitor C_d2And a third partial capacitance C_d3The output end of the second type resonance module is connected with the output end of the second type bridge arm to form a resonant loop;

the input end of the fourth type resonance module is connected with the second voltage division capacitor C_d2And a third partial capacitance C_d3The output end of the fourth type resonance module is connected with the output end of the fourth type bridge arm to formOne path of the resonant circuit.

4. The soft-switched power amplifier of claim 3, wherein the filter network comprises a first filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3A fourth filter capacitor C_f44N filtering loops formed by 4N filtering modules, wherein the number of the filtering modules is the same as that of the bridge arms, and N is a positive integer;

the first filter capacitor C_f1And a second filter capacitor C_f2Connected in series to two ends of the DC power supply unit, and the first filter capacitor C_f1Is connected with the positive terminal of the DC power supply unit, and the second filter capacitor C_f2Is connected to the negative terminal of the dc power supply unit, and one end of the load is connected to the first filter capacitor C_f1And a second filter capacitor C_f2To (c) to (d);

the third filter capacitor C_f3And a fourth filter capacitor C_f4A third filter capacitor C connected in series with two ends of the DC power supply unit_f3Is connected with the positive terminal of the direct current power supply unit, and the fourth filter capacitor C_f4Is connected to the negative terminal of the dc power supply unit, and the other terminal of the load is connected to the third filter capacitor C_f3And a fourth filter capacitor C_f4To (c) to (d);

the filtering module includes: the bridge arm comprises a first type of filtering module, a second type of filtering module, a third type of filtering module and a fourth type of filtering module, wherein the first type of filtering module corresponds to the first type of bridge arm, the second type of filtering module corresponds to the second type of bridge arm, the third type of filtering module corresponds to the third type of bridge arm, and the fourth type of filtering module corresponds to the fourth type of bridge arm;

5. A soft-switched power amplifier, comprising: the system comprises a direct-current power supply unit, an inverter loop, a resonant network and a filter network;

the resonant network comprises a first voltage-dividing capacitor C_d1A second voltage dividing capacitor C_d2And a third voltage dividing capacitor C_d36N resonance circuits formed by 6N resonance modules, wherein the number of the resonance modules is the same as that of the bridge arms, and N is a positive integer;

the inverter loop further comprises at least one third type half-bridge switching power unit, and the number of the third type half-bridge switching power units is the same as that of the first type half-bridge switching power units and that of the second type half-bridge switching power units; the third type of half-bridge switching power unit corresponds to the first type of half-bridge switching power unit and the second type of half-bridge switching power unit one by one, and the third type of half-bridge switching power unit is connected with the corresponding first type of half-bridge switching power unit and the corresponding second type of half-bridge switching power unit in parallel to form a three-phase double-voltage-drop full-bridge inverter;

the negative end of the sixth bridge arm is connected with the positive end of the direct-current power supply unit, and the positive end of the sixth bridge arm is connected with the negative end of the direct-current power supply unit;

the resonance module includes: the bridge arm structure comprises a first-class resonance module, a second-class resonance module, a third-class resonance module, a fourth-class resonance module, a fifth-class resonance module and a sixth-class resonance module, wherein the first-class resonance module corresponds to the first-class bridge arm, the second-class resonance module corresponds to the second-class bridge arm, the third-class resonance module corresponds to the third-class bridge arm, the fourth-class resonance module corresponds to the fourth-class bridge arm, the fifth-class resonance module corresponds to the fifth-class bridge arm, and the sixth-class resonance module corresponds to the sixth-class bridge arm;

the input end of the sixth resonant module is connected to the second voltage dividing capacitor C_d2And a third partial capacitance C_d3And the output end of the sixth type resonance module is connected with the output end of the sixth type bridge arm to form one resonant loop.

6. The soft-switched power amplifier of claim 5, wherein the filter network comprises a first filter capacitor C_f1A second filter capacitor C_f2A third filter capacitor C_f3A fourth filter capacitor C_f4A fifth filter capacitor C_f5A sixth filter capacitor C_f66N filtering loops formed by 6N filtering modules, wherein the number of the filtering modules is the same as that of the bridge arms, and N is a positive integer;

the first filter capacitor C_f1And a second filter capacitor C_f2Connected in series to two ends of the DC power supply unit, and the first filter capacitor C_f1Is connected with the positive terminal of the DC power supply unit, and the second filter capacitor C_f2Is connected to the negative terminal of the dc power supply unit, and the first terminal of the load is connected to the first filter capacitor C_f1And a second filter capacitor C_f2To (c) to (d);

the third filter capacitor C_f3And a fourth filter capacitor C_f4Is connected in series toThe third filter capacitor C is arranged at two ends of the DC power supply unit_f3Is connected with the positive terminal of the direct current power supply unit, and the fourth filter capacitor C_f4Is connected to the negative terminal of the dc power supply unit, and the second terminal of the load is connected to the third filter capacitor C_f3And a fourth filter capacitor C_f4To (c) to (d);

the fifth filter capacitor C_f5And a sixth filter capacitor C_f6A fifth filter capacitor C connected in series with two ends of the DC power supply unit_f5Is connected with the positive terminal of the direct current power supply unit, and the sixth filter capacitor C_f6Is connected to the negative terminal of the dc power supply unit, and the third terminal of the load is connected to the fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d);

the filtering module includes: the bridge arm bridge comprises a first type of filtering module, a second type of filtering module, a third type of filtering module, a fourth type of filtering module, a fifth type of filtering module and a sixth type of filtering module, wherein the first type of filtering module corresponds to the first type of bridge arm, the second type of filtering module corresponds to the second type of bridge arm, the third type of filtering module corresponds to the third type of bridge arm, the fourth type of filtering module corresponds to the fourth type of bridge arm, the fifth type of filtering module corresponds to the fifth type of bridge arm, and the sixth type of filtering module corresponds to the sixth type of bridge arm;

the input end of the third type of filter module is connected with the output end of the third type of bridge arm, and the output end of the third type of filter module is connected with the third filter capacitor C_f3And fourth filteringCapacitor C_f4To (c) to (d);

the input end of the fifth type of filter module is connected with the output end of the fifth type of bridge arm, and the output end of the fifth type of filter module is connected with the fifth filter capacitor C_f5And a sixth filter capacitor C_f6To (c) to (d);

the input end of the sixth type of filter module is connected with the output end of the sixth type of bridge arm, and the output end of the sixth type of filter module is connected with the third filter capacitor C_f3And a fourth filter capacitor C_f4In the meantime.