CN211830601U - Improved three-phase hybrid rectifier based on staggered parallel connection - Google Patents

Abstract

The utility model provides an improved three-phase hybrid rectifier based on interleaved parallel connection, comprising a rectifier bridge Q, an input filter circuit E, a harmonic injection circuit B, a DC-DC Buck chopper, an interleaved parallel circuit P, and a load _R. , compared with the traditional three-phase rectifier, the input current harmonic ratio is improved, the voltage gain is high and the voltage regulation rate is good, and the double-channel is formed by adding interleaved parallel connection, so that the rectifier has lower switching stress, more Large output power and smaller current ripple further improve the efficiency and power density of the rectifier, and the application prospect is very broad.

Description

An Improved Three-Phase Hybrid Rectifier Based on Interleaved Parallel

technical field

The utility model relates to the field of power electronics, in particular to an improved three-phase hybrid rectifier based on interleaved parallel connection.

Background technique

In recent years, power semiconductor devices and control technology have developed rapidly and have been widely used in the field of power electronics. With the continuous innovation of technology, various power electronic devices have emerged as the times require. A rectifier is a device that uses a power electronic switch to convert AC power into DC power. It can convert AC power into DC power that people need to use. With the development of rectification technology, there have been great progress in some key technical fields. But the traditional rectifier circuit has many disadvantages.

With the continuous development of power electronic devices, higher requirements are also placed on the harmonic control in the power grid. For traditional single-phase diode uncontrollable rectifier circuits, the AC side current contains a lot of harmonics, resulting in low power factor and low efficiency of the circuit. Due to these shortcomings, it can no longer meet the needs of high power quality.

Power factor correction (PFC) technology is an effective harmonic suppression method. The traditional three-phase PFC rectifier generally uses a boost circuit, but its output voltage is high, and the voltage stress of the power switching device is high, which is not conducive to the subsequent circuit. The step-down PFC rectifier device is small in size, with increasing power density, faster dynamic response, and greatly improved reliability. At the same time, the current distortion rate is small, the power factor is high, and it has inrush current protection. With the increasing demand for power consumption, this type of circuit has attracted more and more attention.

With the rapid development of rectifier technology, the traditional rectifier topology can no longer meet the requirements. Therefore, the power factor correction stage is not perfect, the total harmonic distortion rate is high, and the output effect is not ideal. For the research of new rectifiers, it has gradually become a trend. The new rectifiers must ensure the operation of unity power factor and have a high voltage gain at the same time. and good voltage regulation, with lower switching stress, higher output power and lower current ripple.

Utility model content

In view of the above-mentioned deficiencies in the prior art, the present utility model provides an improved three-phase hybrid rectifier based on interleaved parallel connection. This circuit can ensure the operation of the unit power factor, and has lower switching stress, greater output power and smaller current ripple. The embodiment of the present utility model adopts the following technical solutions, which are specifically as follows:

The utility model provides an improved three-phase hybrid rectifier based on interleaved parallel connection, comprising a rectifier bridge Q, an input filter circuit E, a harmonic injection circuit B composed of 6 diodes and 6 IGBTs, and a first switch tube ( T ₁ ), a second switch tube (T ₂ ), a first inductor (L ₁ ), a second inductor (L ₂ ), a first diode (D ₁ ), a second diode (D ₂ ) and a capacitor (C) The DC-DC Buck chopper composed of upper and lower series is composed of a first switch tube (Q ₁ ), a second switch tube (Q ₂ ), a third switch tube (Q ₃ ), and a fourth switch tube ( Q ₄ ), the fifth switch tube (Q ₅ ), the sixth switch tube (Q ₆ ), the seventh switch tube (Q ₇ ), the eighth switch tube (Q ₈ ), the first inductance (L _m1 ), the second The interleaved parallel circuit P composed of inductance (L _m2 ) and capacitance (C _o ) is loaded with R ₀ .

According to an improved three-phase hybrid rectifier based on interleaved parallel connection, it is characterized by comprising: a rectifier bridge Q, a harmonic injection circuit B composed of 6 diodes and 6 IGBTs, wherein the connection mode is the first IGBT ( The emitter of S _x1 ) is connected to the collector of the second IGBT (S _x2 ), the anode of the first diode (D _x1 ) is connected to the anode of the second diode (D _x2 ), and the first IGBT (S _x1 ) is connected to the anode of the second diode (D x2 ). ) collector is connected to the cathode of the first diode (D _x1 ), the collector of the second IGBT (S _x2 ) is connected to the cathode of the second diode (D _x2 ); the third IGBT (S _y1 ) The emitter is connected to the collector of the fourth IGBT (S _y2 ), the anode of the third diode (D _y1 ) is connected to the anode of the fourth diode (D _y2 ), and the collector of the third IGBT (S _y1 ) Connected to the cathode of the third diode (D _y1 ), the collector of the fourth IGBT (S _y2 ) is connected to the cathode of the fourth diode (D _y2 ); the emitter of the fifth IGBT (S _z1 ) is connected to the cathode of the fourth IGBT (S y2 ) The collectors of the six IGBTs (S _z2 ) are connected, the anodes of the fifth diodes (D _z1 ) are connected to the anodes of the sixth diodes (D _z2 ), and the collectors of the fifth IGBTs (S _z1 ) are connected to the fifth and second diodes (D z1 ). The cathode of the electrode tube (D _z1 ) is connected, the collector of the sixth IGBT (S _z2 ) is connected with the cathode of the sixth diode (D _z2 ); the anode of the seventh diode (D ₁ ) is connected with the eighth diode _The cathode of the tube (D2) is connected _; the anode of the seventh diode (D1) is connected to the cathode of the second diode ( _Dx2 ), the cathode of the fourth diode ( _Dy2 ), the sixth diode (D _z2 ) cathode connection.

According to the improved three-phase hybrid rectifier based on interleaved parallel connection, it is characterized in that the DC-DC Buck circuit is composed of a first switch tube (T ₁ ), a second switch tube (T ₂ ), a first inductance (L ₁ ), the second inductor (L ₂ ), the seventh diode (D ₁ ), the eighth diode (D ₂ ) and the capacitor (C); the collector of the first switch tube (T ₁ ) connected to the common cathode of the rectifier bridge (Q); the emitter of the second switch tube (T ₂ ) is connected to the common anode of the rectifier bridge (Q); one end of the first inductor (L ₁ ) is connected to the first switch tube (T _{1 )} ) and the cathode of the seventh diode (D ₁ ) are connected; the other end of the first inductor (L ₁ ) is connected to the first capacitor (C); the other end of the first capacitor (C) is connected to the second inductor One end of (L ₂ ) is connected; the other end of the second inductor (L ₂ ) is connected to the anode of the eighth diode (D ₂ ) and the collector of the second switch tube (T ₂ ).

The improved three-phase hybrid rectifier based on interleaved parallel connection is characterized in that the interleaved parallel circuit is composed of a first switch tube (Q ₁ ), a second switch tube (Q ₂ ), and a third switch tube ( Q ₃ ), fourth switch tube (Q ₄ ), fifth switch tube (Q ₅ ), sixth switch tube (Q ₆ ), seventh switch tube (Q ₇ ), eighth switch tube (Q ₈ ), An inductor (L _m1 ), a second inductor (L _m2 ) and a capacitor (C _o ) are formed; one end of the first inductor (L ₁ ) is respectively connected with one end of the first capacitor (C), one end of the capacitor (C _o ), The drains of the first switch tube (Q ₁ ), the third switch tube (Q ₃ ), the fifth switch tube (Q ₅ ), and the seventh switch tube (Q ₇ ) are connected; one end of the second inductor (L ₂ ) is respectively and the other end of the first capacitor (C), the other end of the capacitor (C _o ) and the second switch tube (Q ₂ ), the fourth switch tube (Q ₄ ), the sixth switch tube (Q ₆ ), and the eighth switch The source stage of the tube (Q ₈ ) is connected; one end of the first inductor (L _m1 ) is connected to the source stage of the first switch tube (Q ₁ ), the drain stage of the second switch tube (Q ₂ ), and the first inductor (L The other end of _m1 ) is connected to the source stage of the third switch tube (Q ₃ ) and the drain stage of the fourth switch tube (Q ₄ ); one end of the second inductor (L _m2 ) is connected to the source stage of the fifth switch tube (Q ₅ ) The source stage and the drain stage of the sixth switch tube (Q ₆ ) are connected, and the other end of the second inductor (L _m2 ) is connected to the source stage of the seventh switch tube (Q ₇ ) and the drain stage of the eighth switch tube (Q ₈ ). connect.

Preferably, the improved three-phase hybrid rectifier based on interleaved parallel connection is characterized in that the rectifier bridge Q and the DC-DC Buck chopper can control the first switch tube (T ₁ ), the second The switch tube (T ₂ ) realizes the rectification function and adopts high-frequency PWM modulation technology. Since the on and off states of the device can be controlled, the advantage of this circuit is that the input current in the same phase as the input voltage can be obtained, that is, the input power With a factor of 1, the harmonic content of the input current can be close to zero.

Preferably, the improved three-phase hybrid rectifier based on interleaved parallel connection is characterized in that the interleaved parallel circuit can control the first switch tube (Q ₁ ), the second switch tube (Q ₂ ), the third switch tube (Q ₃ ), fourth switch tube (Q ₄ ), fifth switch tube (Q ₅ ), sixth switch tube (Q ₆ ), seventh switch tube (Q ₇ ), eighth switch tube (Q ₈ ) It realizes the rise and fall of the output voltage, has a wide output voltage range, has a high voltage regulation rate and load regulation rate, and can effectively reduce the output current ripple by superimposing the current phase dislocation.

The utility model has the following beneficial effects: after adopting the technical scheme, the unit power factor operation can be realized, the full voltage range can be adjusted, and the rectifier has lower switching stress and greater output power by adding interlaced parallel connection to form dual channels. and smaller current ripple, further improving the efficiency and power density of the rectifier, and greatly improving the reliability, which has great theoretical and practical significance.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. It is obvious that the accompanying drawings in the following description These are just some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work:

FIG. 1 is a structural diagram of an improved three-phase hybrid rectifier based on interleaved parallel connection.

FIG. 2 is an equivalent circuit diagram of the first and second switch tubes of the improved three-phase hybrid rectifier corresponding to the switch states of (ON, ON).

FIG. 3 is an equivalent circuit diagram of the first and second switch tubes of the improved three-phase hybrid rectifier corresponding to the switch states of (ON, OFF).

FIG. 4 is an equivalent circuit diagram of the first and second switch tubes of the improved three-phase hybrid rectifier corresponding to the switch states of (OFF, ON).

FIG. 5 is an equivalent circuit diagram of the first and second switch tubes of the improved three-phase hybrid rectifier corresponding to the switch states of (OFF, OFF).

Fig. 6 The first stage of the step-up process of the interleaved parallel circuit of the improved three-phase hybrid rectifier.

Fig. 7 The second stage of the step-up process of the interleaved parallel circuit of the improved three-phase hybrid rectifier.

Figure 8. The third stage of the step-up process of the interleaved parallel circuit of the improved three-phase hybrid rectifier.

Fig. 9 The fourth stage of the step-up process of the interleaved parallel circuit of the improved three-phase hybrid rectifier.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It should be noted that the embodiments described herein are only partial embodiments of the present utility model, and Not all implementations of the present invention, the embodiments are only exemplary.

The utility model provides an improved three-phase hybrid rectifier based on interleaved parallel connection, as shown in FIG. 1 , comprising a rectifier bridge Q, an input filter circuit E, a harmonic injection circuit B composed of 6 diodes and 6 IGBTs, It consists of a first switch tube (T ₁ ), a second switch tube (T ₂ ), a first inductor (L ₁ ), a second inductor (L ₂ ), a first diode (D ₁ ), and a second diode (D ₂ ) and capacitor (C) are connected up and down the DC-DC Buck chopper, which consists of a first switch tube (Q ₁ ), a second switch tube (Q ₂ ), and a third switch tube (Q ₃ ) , the fourth switch tube (Q ₄ ), the fifth switch tube (Q ₅ ), the sixth switch tube (Q ₆ ), the seventh switch tube (Q ₇ ), the eighth switch tube (Q ₈ ), the first inductor ( The interleaved parallel circuit P composed of L _m1 ), the second inductance (L _m2 ) and the capacitance (C _o ) is loaded with R ₀ .

According to an improved three-phase hybrid rectifier based on interleaved parallel connection, it is characterized by comprising: a rectifier bridge Q, a harmonic injection circuit B composed of 6 diodes and 6 IGBTs, wherein the connection mode is the first IGBT ( The emitter of S _x1 ) is connected to the collector of the second IGBT (S _x2 ), the anode of the first diode (D _x1 ) is connected to the anode of the second diode (D _x2 ), and the first IGBT (S _x1 ) is connected to the anode of the second diode (D x2 ). ) collector is connected to the cathode of the first diode (D _x1 ), the collector of the second IGBT (S _x2 ) is connected to the cathode of the second diode (D _x2 ); the third IGBT (S _y1 ) The emitter is connected to the collector of the fourth IGBT (S _y2 ), the anode of the third diode (D _y1 ) is connected to the anode of the fourth diode (D _y2 ), and the collector of the third IGBT (S _y1 ) Connected to the cathode of the third diode (D _y1 ), the collector of the fourth IGBT (S _y2 ) is connected to the cathode of the fourth diode (D _y2 ); the emitter of the fifth IGBT (S _z1 ) is connected to the cathode of the fourth IGBT (S y2 ) The collectors of the six IGBTs (S _z2 ) are connected, the anodes of the fifth diodes (D _z1 ) are connected to the anodes of the sixth diodes (D _z2 ), and the collectors of the fifth IGBTs (S _z1 ) are connected to the fifth and second diodes (D z1 ). The cathode of the diode (D _z1 ) is connected, the collector of the sixth IGBT (S _z2 ) is connected with the cathode of the sixth diode (D _z2 ); the anode of the seventh diode (D ₁ ) is connected with the eighth diode _The cathode of the tube (D2) is connected _; the anode of the seventh diode (D1) is connected to the cathode of the second diode ( _Dx2 ), the cathode of the fourth diode ( _Dy2 ), the sixth diode (D _z2 ) cathode connection.

According to the improved three-phase hybrid rectifier based on interleaved parallel connection, it is characterized in that the DC-DC Buck circuit is composed of a first switch tube (T ₁ ), a second switch tube (T ₂ ), a first inductance (L ₁ ), the second inductor (L ₂ ), the seventh diode (D ₁ ), the eighth diode (D ₂ ) and the capacitor (C); the collector of the first switch tube (T ₁ ) connected to the common cathode of the rectifier bridge (Q); the emitter of the second switch tube (T ₂ ) is connected to the common anode of the rectifier bridge (Q); one end of the first inductor (L ₁ ) is connected to the first switch tube (T _{1 )} ) and the cathode of the seventh diode (D ₁ ) are connected; the other end of the first inductor (L ₁ ) is connected to the first capacitor (C); the other end of the first capacitor (C) is connected to the second inductor One end of (L ₂ ) is connected; the other end of the second inductor (L ₂ ) is connected to the anode of the eighth diode (D ₂ ) and the collector of the second switch tube (T ₂ ).

The improved three-phase hybrid rectifier based on interleaved parallel connection is characterized in that the interleaved parallel circuit is composed of a first switch tube (Q ₁ ), a second switch tube (Q ₂ ), and a third switch tube ( Q ₃ ), fourth switch tube (Q ₄ ), fifth switch tube (Q ₅ ), sixth switch tube (Q ₆ ), seventh switch tube (Q ₇ ), eighth switch tube (Q ₈ ), An inductor (L _m1 ), a second inductor (L _m2 ) and a capacitor (C _o ) are formed; one end of the first inductor (L ₁ ) is respectively connected with one end of the first capacitor (C), one end of the capacitor (C _o ), The drains of the first switch tube (Q ₁ ), the third switch tube (Q ₃ ), the fifth switch tube (Q ₅ ), and the seventh switch tube (Q ₇ ) are connected; one end of the second inductor (L ₂ ) is respectively and the other end of the first capacitor (C), the other end of the capacitor (C _o ) and the second switch tube (Q ₂ ), the fourth switch tube (Q ₄ ), the sixth switch tube (Q ₆ ), and the eighth switch The source stage of the tube (Q ₈ ) is connected; one end of the first inductor (L _m1 ) is connected to the source stage of the first switch tube (Q ₁ ), the drain stage of the second switch tube (Q ₂ ), and the first inductor (L The other end of _m1 ) is connected to the source stage of the third switch tube (Q ₃ ) and the drain stage of the fourth switch tube (Q ₄ ); one end of the second inductor (L _m2 ) is connected to the source stage of the fifth switch tube (Q ₅ ) The source stage and the drain stage of the sixth switch tube (Q ₆ ) are connected, and the other end of the second inductor (L _m2 ) is connected to the source stage of the seventh switch tube (Q ₇ ) and the drain stage of the eighth switch tube (Q ₈ ). connect.

According to the improved three-phase hybrid rectifier based on interleaved parallel connection, it is characterized in that each switching tube of the harmonic injection circuit is turned on to correspond to four working modes, and the input current can be tracked by PWM modulation. Correction of power factor, in which the third IGBT (S _y1 ) and the fourth IGBT (S _y2 ) are turned on as an example:

first working state

The DC bus inductor current I _DC will flow through two of the AC three phases or through the freewheeling diode to maintain a continuous current state. When the switching states of the first switch tube (T ₁ ) and the second switch tube (T ₂ ) are ( ON, ON), as shown in Figure 2, there are:

I _A = I _DC , I _B = 0, I _C = - I _DC

The space vector corresponding to the grid-side current of the rectifier is:

In the second working state, when the switching states of the first switch tube (T ₁ ) and the second switch tube (T ₂ ) are (ON, OFF), as shown in FIG. 3 , there are:

I _A = I _DC , I _B = -I _DC , I _C = 0

The space vector corresponding to the grid-side current of the rectifier is:

In the third working state, when the switching states of the first switch tube (T ₁ ) and the second switch tube (T ₂ ) are (OFF, ON), as shown in FIG. 4 , there are:

I _A = 0, I _B = I _DC , I _C = -I _DC

The space vector corresponding to the grid-side current of the rectifier is:

In the fourth working state, when the switching states of the first switch tube (T ₁ ) and the second switch tube (T ₂ ) are (OFF, OFF), as shown in FIG. 5 , there are:

I _A =0, I _B =0, I _C =0

The space vector corresponding to the grid-side current of the rectifier is:

According to the improved three-phase hybrid rectifier based on interleaved parallel connection, it is characterized in that the interleaved parallel circuit can realize step-up and step-down, and the output voltage range is wide. Taking the step-up process as an example, it is divided into four stages. :

The first stage

The input currents from t ₀ to t ₁ flow through two loops, as shown in Figure 6: one is through the first switch tube (Q ₁ ), the first inductor (L _m1 ), and the fourth switch tube (Q ₄ ); the other way It is to supply power to the load R ₀ through the fifth switch tube (Q ₅ ), the second inductor (L ₂ ), and the eighth switch tube (Q ₈ ); the capacitor (C _o ).

second stage

The input current from t ₁ to t ₂ flows through two loops, as shown in Figure 7: one is through the first switch tube (Q ₁ ), the first inductor (L _m1 ), and the fourth switch tube (Q ₄ ); the other way After passing through the fifth switch tube (Q ₅ ), the second inductor (L ₂ ), and the seventh switch tube (Q ₇ ), the current charges the capacitor (C _o ) and supplies power to the load R ₀ .

The third phase

The input currents from t ₂ to t ₃ flow through two loops, as shown in Figure 8: one way is through the first switch tube (Q ₁ ), the first inductor (L _m1 ), and the fourth switch tube (Q ₄ ); the other way It is to supply power to the load R ₀ through the fifth switch tube (Q ₅ ), the second inductor (L ₂ ), and the eighth switch tube (Q ₈ ); the capacitor (C _o ).

fourth stage

The input currents from t ₃ to t ₄ flow through two loops, as shown in Figure 9 : one way is through the first switch tube (Q ₁ ), the first inductor (L _m1 ), and the third switch tube (Q ₃ ), the current Charge the capacitor (C _o ) and supply power to the load R ₀ ; the other way is through the fifth switch tube (Q ₅ ), the second inductor (L ₂ ), and the eighth switch tube (Q ₈ ).

The embodiments of the present utility model have been described above, and the above-mentioned specific embodiments are only illustrative, rather than the limitations of the technical solutions, so the present utility model is not limited to the above-mentioned specific embodiments, and all the common techniques in the field Personnel without departing from the purpose and concept of the present utility model, and other simple replacements and various changes to the technical solutions of the present utility model, all belong to the protection scope of the present utility model.

Claims (4)

1. The utility model provides an improved generation three-phase hybrid rectifier based on crisscross parallel, its characterized in that: comprises a rectifier bridge Q, an input filter circuit E, a harmonic injection circuit B composed of 6 diodes and 6 IGBTs, and a first switch tube (T)₁) A second switch tube (T)₂) A first inductor (L)₁) A second inductor (L)₂) A first diode (D)₁) A second diode (D)₂) A DC-DC Buck chopper consisting of a capacitor (C) and connected in series from top to bottom, and a first switching tube (Q)₁) A second switch tube (Q)₂) And a third switching tube (Q)₃) And a fourth switching tube (Q)₄) And a fifth switching tube (Q)₅) And a sixth switching tube (Q)₆) And a seventh switching tube (Q)₇) And an eighth switching tube (Q)₈) A first inductor (L)_m1) A second inductor (L)_m2) And a capacitor (C)_o) Forming an interleaved parallel circuit P, a load R₀。

2. The improved three-phase hybrid rectifier based on interleaved parallel connection as claimed in claim 1, comprising: a rectifier bridge Q, a harmonic injection circuit B composed of 6 diodes and 6 IGBTs, wherein the connection mode is a first IGBT (S)_x1) And the second IGBT (S)_x2) Is connected to the collector of the first diode (D)_x1) And a second diode (D)_x2) Is connected to the anode of the first IGBT (S)_x1) Collector electrode of (2) and first diode (D)_x1) Is connected to the cathode of the second IGBT (S)_x2) Collector and second diode (D)_x2) The cathode of (a) is connected; third IGBT (S)_y1) And the fourth IGBT (S)_y2) Is connected to the collector of a third diode (D_y1) Anode of (D) and a fourth diode (D)_y2) Is connected to the anode of the third IGBT (S)_y1) Collector and third diode (D)_y1) Is connected to the cathode of the fourth IGBT (S)_y2) Collector and fourth diode (D)_y2) The cathode of (a) is connected; fifth IGBT (S)_z1) Emitter of (2) and sixth IGBT (S)_z2) Is connected to the collector of a fifth diode (D)_z1) And the sixth diode (D)_z2) Is connected to the anode of the fifth IGBT (S)_z1) Collector and fifth diode (D)_z1) Is connected to the cathode of the sixth IGBT (S)_z2) Collector and sixth diode (D)_z2) The cathode of (a) is connected; seventh diode (D)₁) Anode of (D) and an eighth diode (D)₂) The cathode of (a) is connected; seventh diode (D)₁) And a second diode (D)_x2) Cathode of (D), fourth diode (D)_y2) Cathode of (2), sixth diode (D)_z2) Is connected to the cathode.

3. An improved three-phase hybrid rectifier based on interleaved parallel connection according to claim 2, wherein said DC-DC Buck circuit is formed by a first switching transistor (T)₁) A second switch tube (T)₂) A first inductor (L)₁) A second inductor (L)₂) A seventh diode (D)₁) An eighth diode (D)₂) And a capacitor (C); first switch tube (T)₁) The collector of the rectifier bridge (Q) is connected with the common cathode of the rectifier bridge (Q); a second switch tube (T)₂) Is connected with the common anode of the rectifier bridge (Q); first inductance (L)₁) And a first switching tube (T)₁) Emitter of (2), seventh diode (D)₁) The cathode of (a) is connected; first inductance (L)₁) The other end of the first capacitor (C) is connected with the first capacitor (C); the other end of the first capacitor (C) and the second inductor (L)₂) Is connected with one end of the connecting rod; second inductance (L)₂) And the other end of the diode (D) and an eighth diode (D)₂) Anode of (2), second switching tube (T)₂) Is connected to the collector of (a).

4. The improved three-phase hybrid rectifier based on interleaved parallel connection according to claim 3The said interleaving parallel circuit consists of the first switch tube (Q)₁) A second switch tube (Q)₂) And a third switching tube (Q)₃) And a fourth switching tube (Q)₄) And a fifth switching tube (Q)₅) And a sixth switching tube (Q)₆) And a seventh switching tube (Q)₇) And an eighth switching tube (Q)₈) A first inductor (L)_m1) A second inductor (L)_m2) And a capacitor (C)_o) Forming; first inductance (L)₁) One end of the first capacitor (C) and one end of the second capacitor (C) are respectively connected with the capacitor (C)_o) One end of (1), a first switching tube (Q)₁) And a third switching tube (Q)₃) And a fifth switching tube (Q)₅) And a seventh switching tube (Q)₇) The drain connection of (1); second inductance (L)₂) One end of the first capacitor (C) is respectively connected with the other end of the first capacitor (C) and the capacitor (C)_o) And the other end of the first switch tube (Q)₂) And a fourth switching tube (Q)₄) And a sixth switching tube (Q)₆) And an eighth switching tube (Q)₈) A source level connection of; first inductance (L)_m1) And a first switching tube (Q)₁) Source stage of (2), second switching tube (Q)₂) First inductance (L) of the drain connection_m1) And the other end of the third switch tube (Q)₃) Source stage, fourth switching tube (Q)₄) The drain connection of (1); second inductance (L)_m2) And one end of the fifth switching tube (Q)₅) Source stage of (2), sixth switching tube (Q)₆) Of the second inductor (L)_m2) And the other end of the fourth switching tube (Q)₇) Source stage of (2), eighth switching tube (Q)₈) Is connected.

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