CN102545630A - Multi-module combined converter with recycling cross rectification function - Google Patents

Abstract

The invention discloses a multi-module combination converter for circular cross rectification, which is composed of several modules connected together, and each module is composed of a bridge circuit, a high-frequency isolation transformer, a rectifier circuit and an inductance connected in sequence; the bridge type of each module The input terminals of the circuit are connected in parallel, and the output terminals of each inductor are connected in parallel. The input and output terminals of multiple modules of the combined converter can realize natural current sharing, without the need for current sampling of the module circuit, and the need for a current sharing control loop, which simplifies the control link and improves the reliability of the combined converter system and power density, reducing costs.

Description

A Multi-Module Combination Converter with Cyclic Cross-Rectification

technical field

The invention belongs to the technical field of power electronics, and in particular relates to a parallel combination converter of a plurality of direct current converter modules for cyclic cross rectification.           

Background technique

With the development of science and technology, the voltage and current levels of the power system have been significantly improved, and the requirements for the capacity, power density and reliability of the power system are also getting higher and higher. In the occasions where the input and output voltages are low and the current level is high, the combination of input-parallel-output-parallel (IPOP) has been widely used. This connection method reduces the power level of a single module and the current stress of the power switch tube in the module circuit, and a higher frequency switch tube can be used to reduce the EMI radiation of the circuit. In addition, the input and output ripples of each module circuit can be canceled out by interleaving control, thereby reducing the size of the corresponding filter.

However, in the application where multiple modules are connected in parallel, due to the differences in the parameters of each module, some modules may have a large output current, and some modules may have a small output current or even no output. Bearing greater current stress and thermal stress, it is prone to failure and aging, thereby reducing the reliability and efficiency of the entire converter. Therefore, it is very important to consider the current sharing among the modules of the parallel combined converter.

There are many kinds of current parallel current sharing technologies, mainly including drooping method and active current sharing method. In particular, the active current sharing method has many disadvantages: they need to detect the current of each module, and the accuracy of sampling has a great influence on the current sharing of the system, and the accuracy of sampling is affected by the parasitic parameters of the sampling circuit components and the life of the sampling circuit; The current sharing bus is required in the control mode, and the whole system may not work normally when the current sharing bus fails or is disturbed; the current sharing controller complicates the control link of the whole system, which makes the design of the control system more difficult.

Contents of the invention

The purpose of the present invention is to address the shortcomings of the prior art and provide a multi-module combined converter with circular cross rectification. The present invention can realize multi-module parallel connection and natural current sharing without sampling the module current or adding a current sharing loop.

In order to achieve the above object, the technical solution adopted by the present invention is: a multi-module combined converter with circular cross-rectification, which is composed of several modules connected together, and each module is composed of a bridge circuit, a high-frequency isolation transformer, a rectifier circuit and The inductors are connected in sequence; the input ends of the bridge circuits of each module are connected in parallel, and the output ends of each inductor are connected in parallel.

Further, the bridge circuit is a full bridge circuit or a half bridge circuit.

Further, the bridge circuit is a full bridge circuit, and the converter also includes a DC blocking capacitor connected between any bridge arm of the full bridge circuit and the primary side of the high frequency isolation transformer between.

Further, the rectification circuit is a full-bridge rectification circuit or a full-wave rectification circuit.

Further, the rectifier circuit is a full-bridge rectifier circuit, the primary side and the secondary side of the high-frequency isolation transformer are both single windings, and the full-bridge rectifier circuit includes four rectifier diodes D _1a -D _1d , wherein the rectifier diode D _1a The anode of the rectifier diode D _1c is connected to the cathode of the rectifier diode D 1c to form a bridge arm, the anode of the rectifier diode D _1b is connected to the cathode of the rectifier diode D _1d to form another bridge arm, the anode of the rectifier diode D _1c is connected to the anode of the rectifier diode D _1d Connected and grounded, the midpoint of the two bridge arms is connected to the secondary side of the high-frequency isolation transformer, the cathode of the rectifier diode D _1a is defined as the first output port of the full-bridge rectifier circuit, and the cathode of the rectifier diode D _1b is the output port of the full-bridge rectifier circuit The second output port; the first output port of the full-bridge rectifier circuit of each module is connected to the inductance of the module, the second output port of the full-bridge rectifier circuit of each module is connected to the inductance of the next module, and the full-bridge rectifier circuit of the last module The second output port of is connected to the inductance of the first module.

Further, the rectification circuit is a full-wave rectification circuit. The high-frequency isolation transformer has a single winding on the primary side and a double winding on the secondary side with a center tap. The full-wave rectification circuit includes three diodes D ₁₁ -D ₁₃ , and the diode D ₁₁ and the anode of diode D ₁₂ are respectively connected to the secondary side of the high-frequency isolation transformer, the anode of diode D ₁₃ is connected to the center tap of the high-frequency isolation transformer and grounded, and the cathode of diode D ₁₃ is connected to the cathode of diode D ₁₁ ; the cathode of diode D ₁₁ is defined as The first output port of the full-wave rectification circuit, the cathode of the diode D ₁₂ is the second output port of the full-wave rectification circuit; the first output port of the full-wave rectification circuit of each module is connected to the inductance of the module, and the full-wave rectification of each module The second output port of the circuit is connected to the inductance of the next module, and the second output port of the full-wave rectification circuit of the last module is connected to the inductance of the first module.

Compared with the prior art, the beneficial effect of the present invention is that multiple bridge converters are connected in parallel, which can increase the power level of the whole system, reduce the current stress of switching devices in the module circuit, and easily realize high frequency. Compared with the traditional parallel bridge circuit, only the connection mode of the rectifier diode on the secondary side of the transformer is changed, and there are fewer additional components; the circular cross rectification of the module is used to eliminate the unbalanced output filter inductor current caused by the inconsistency of the module parameters, that is, the half bridge circuit is used The bridge arm capacitor or the DC blocking capacitor added by the full bridge circuit can dynamically adjust the rectified output voltage and force the two output filter inductors to share the current. The combined converter realizes natural current sharing, does not require current sampling for each module circuit, and does not need to add a current sharing control loop, which greatly simplifies control. The power density and reliability of the combined converter are improved, and the cost is also reduced.

Description of drawings

Fig. 1 is the circuit schematic diagram of the first embodiment of the combined converter of the present invention;

Fig. 2 is the circuit principle diagram of the second embodiment of the combined converter of the present invention;

Fig. 3 is the circuit schematic diagram of the third embodiment of the combined converter of the present invention;

Fig. 4 is the schematic circuit diagram of the fourth embodiment of the combined converter of the present invention;

Fig. 5 is a driving timing diagram of the combined converter of the present invention.

Detailed ways

The purpose and effects of the present invention will become more apparent by describing the present invention in detail according to the accompanying drawings and embodiments.

As shown in FIG. 1 , as a first embodiment of the present invention, the main circuit of the combined converter includes a half-bridge module circuit of three transformer secondary full-bridge circular cross-rectification. The half-bridge circuit Hp1, the high-frequency isolation transformer T1 and the full-bridge rectifier circuit re1 form the first circuit module; the half-bridge circuit Hp2, the high-frequency isolation transformer T2 and the full-bridge rectifier circuit re2 form the second circuit module; The half-bridge circuit Hp3, the high-frequency isolation transformer T3 and the full-bridge rectifier circuit re3 constitute the third circuit module; the output loops of the rectifier circuits re1, re2, re3 are cross-connected with the output filter inductors L1, L2, L3. Since the internal structures of the three circuit modules are the same, for the convenience of explanation, only the internal structure of one of the circuit modules is described below:

The half-bridge circuit Hp1 is composed of switching tubes Q11, Q12 and bridge arm capacitors C11, C12. The switching tubes Q11, Q12 are metal oxide silicon field effect transistors (MOSFEET). The source of the upper MOSFET of the bridge arm is connected to the drain of the lower MOSFET. That is, the source of Q11 is connected to the drain of Q12. The half-bridge capacitors C11 and C12 are connected in series, and the other end of C11 is connected to the drain of the switching tube Q11 as the positive terminal of the input terminal, and the other terminal of C12 is connected to the source terminal of the switching tube Q12 as the negative terminal of the input terminal. The midpoint of the bridge arm composed of the switching tube and the midpoint of the bridge arm composed of the capacitor of the bridge arm are led out as output ports of the half-bridge circuit, respectively connected to the primary port of the high-frequency isolation transformer T1. The high-frequency isolation transformer T1 has a single winding on the primary side and a single winding on the secondary side. The full-bridge rectifier circuit re1 is composed of four bridge arm diodes D1a, D1b, D1c, and D1d: the cathode of the diode D1c is connected to the anode of the diode D1a, and the cathode of the diode D1d is connected to the anode of the diode D1b. The connection points of the two groups of bridge arm diodes are taken out as the input ports of the full-bridge rectifier circuit re1, the cathodes of D1a and D1b are respectively used as the two positive output ports 1 and 2 of the full-bridge rectifier circuit re1, and the anodes of D1c and D1d are connected. The point is used as the negative output port of the full-bridge rectifier circuit re1. The input port of the full bridge rectifier circuit re1 is connected to the secondary port of the high frequency isolation transformer T1. The positive output port 1 of the full-bridge rectifier circuit re1 is connected to the output filter inductor L1, and the positive output port 2 of the full-bridge rectifier circuit re1 is connected to the output filter inductor L2 of the second module. The port connecting the transformer T1 with the source of the power switching tube Q11 and the drain of the power switching tube Q12 is marked as port 1, and the port connecting the transformer T1 with the cathode of the diode D1c and the anode of the diode D1a is marked as port 2, then the port 1 and port 2 are a group of terminals with the same name of the transformer T1.

The gate and source of each power switch tube are led out to connect to the drive signal. Power switch tube Q11 uses drive signal 1, power switch tube Q12 uses drive signal 2, power switch tube Q21 uses drive signal 3, power switch tube Q22 uses drive signal 4, power switch tube Q31 uses drive signal 5, and power switch tube Q32 uses Drive signal6.

As shown in FIG. 2 , as a second embodiment of the present invention, the main circuit of the combined converter includes three half-bridge module circuits with full-wave circular cross-rectification on the secondary side of the transformer. The half-bridge circuit Hp1, the high-frequency isolation transformer T1 and the full-wave rectification circuit re1 form the first circuit module; the half-bridge circuit Hp2, the high-frequency isolation transformer T2 and the full-wave rectification circuit re2 form the second circuit module; The half-bridge bridge circuit Hp3, the high-frequency isolation transformer T3 and the full-wave rectification circuit re3 constitute the third circuit module; the output loops of the rectification circuits re1, re2, re3 are cross-connected to the output filter inductors L1, L2, L3. Since the internal structures of the three circuit modules are the same, for the convenience of explanation, only the internal structure of one of the circuit modules is described below:

The half-bridge circuit Hp1 is composed of switching tubes Q11, Q12 and bridge arm capacitors C11, C12. The switching tubes Q11, Q12 are metal oxide silicon field effect transistors (MOSFEET). The source of the upper MOSFET of the bridge arm is connected to the drain of the lower MOSFET. That is, the source of Q11 is connected to the drain of Q12. The half-bridge capacitors C11 and C12 are connected in series, and the other end of C11 is connected to the drain of the switching tube Q11 as the positive terminal of the input terminal, and the other terminal of C12 is connected to the source terminal of the switching tube Q12 as the negative terminal of the input terminal. The midpoint of the bridge arm composed of the switching tube and the midpoint of the bridge arm composed of the capacitor of the bridge arm are led out as output ports of the half-bridge circuit, respectively connected to the primary port of the high-frequency isolation transformer T1. The high-frequency isolation transformer T1 has a single winding on the primary side and a double winding on the secondary side with a center tap. The full-wave rectification circuit re1 is composed of two rectification diodes: the anodes of the rectification diodes D11 and D12 are used as input ports of the rectification circuit, and are respectively connected to the secondary ports of the high-frequency isolation transformer. The anode of the diode D13 is connected to the center tap of the high frequency isolation transformer, and the cathode of the diode D13 is connected to the cathode of the diode D11. The cathodes of the rectifier diodes D11 and D12 are used as the positive output ports 1 and 2 of the full-wave rectification circuit re1 respectively, and the center tap of the secondary side of the high-frequency isolation transformer T1 is used as the negative output port of the full-wave rectification circuit re1. The positive output port 1 of the full-wave rectification circuit re1 is connected to the output filter inductor L1, and the positive output port 2 of the full-wave rectification circuit re1 is connected to the output filter inductor L2 of the second module. The port connecting the high-frequency isolation transformer T1 to the source of the power switching tube Q11 and the drain of the power switching tube Q12 is marked as port 1, and the port connecting the high-frequency isolation transformer T1 to the anode of the diode D11 is marked as port 2. High-frequency isolation The port where the transformer T1 is connected to the anode of the diode D12 is marked as port 3, then port 1 and port 2 are a group of terminals with the same name of the high-frequency isolation transformer T1, and ports 1 and 3 are a group of terminals with the same name of the high-frequency isolation transformer T1.

The gate and source of each power switch tube are led out to connect to the drive signal. Power switch tube Q11 uses drive signal 1, power switch tube Q12 uses drive signal 2, power switch tube Q21 uses drive signal 3, power switch tube Q22 uses drive signal 4, power switch tube Q31 uses drive signal 5, and power switch tube Q32 uses Drive signal6.

As shown in FIG. 3 , as a third embodiment of the present invention, the main circuit of the combined converter includes three full-bridge module circuits with full-bridge circular cross-rectification on the secondary side of the transformer. Full bridge bridge circuit Hp1, DC blocking capacitor C1, high frequency isolation transformer T1 and full bridge rectifier circuit re1 constitute the first circuit module; full bridge bridge circuit Hp2, DC blocking capacitor C2, high frequency isolation transformer T2 and full bridge The rectifier circuit re2 forms the second circuit module; the full-bridge bridge circuit Hp3, the DC blocking capacitor C3, the high-frequency isolation transformer T3 and the full-bridge rectifier circuit re3 form the third circuit module; the output cycles of the rectifier circuits re1, re2, and re3 Cross-connect to output filter inductors L1, L2, L3. Since the internal structures of the three circuit modules are the same, for the convenience of explanation, only the internal structure of one of the circuit modules is described below:

The full-bridge circuit Hp1 is composed of switching tubes Q11, Q12, Q13, and Q14. The switching tubes Q11, Q12, Q13, and Q14 are metal oxide silicon field-effect transistors (MOSFEETs). The source of the upper MOSFET of the bridge arm is connected to the drain of the lower MOSFET. , that is, the source of Q11 is connected to the drain of Q12, and the source of Q13 is connected to the drain of Q14. Connect the drains of the upper transistors Q13 and Q11 of the bridge arm as the positive pole of the input terminal, and connect the sources of the lower transistors Q14 and Q12 of the bridge arm as the negative pole of the input terminal. The midpoint of the bridge arm composed of two sets of switch tubes is taken out as the output port of the full bridge circuit. The high-frequency isolation transformer T1 has a single winding on the primary side and a single winding on the secondary side. The full-bridge rectifier circuit re1 is composed of four bridge arm diodes D1a, D1b, D1c, and D1d: the cathode of the diode D1c is connected to the anode of the diode D1a, and the cathode of the diode D1d is connected to the anode of the diode D1b. The connection points of the two groups of bridge arm diodes are taken out as the input ports of the full-bridge rectifier circuit re1, the cathodes of D1a and D1b are respectively used as the two positive output ports 1 and 2 of the full-bridge rectifier circuit re1, and the anodes of D1c and D1d are connected. The point is used as the negative output port of the full-bridge rectifier circuit re1. The input port of the full-bridge rectifier circuit re1 is connected to the secondary port of the high-frequency isolation transformer T1. The positive output port 1 of the full-bridge rectifier circuit re1 is connected to the output filter inductor L1, and the positive output port 2 of the full-bridge rectifier circuit re1 is connected to the output filter inductor L2 of the second module. The port connecting the transformer T1 with the source of the power switching tube Q11 and the drain of the power switching tube Q12 is marked as port 1, and the port connecting the transformer T1 with the cathode of the diode D1c and the anode of the diode D1a is marked as port 2, then the port 1 and port 2 are a group of terminals with the same name of the transformer T1.

The gate and source of each power switch tube are led out to connect to the drive signal. Power switch tube Q11, power switch tube Q14 share drive signal 1, power switch tube Q12, power switch tube Q13 share drive signal 2, power switch tube Q21, power switch tube Q24 share drive signal 3, power switch tube Q22, power switch tube Q23 shares drive signal 4 , power switch tube Q31 and power switch tube Q34 share drive signal 5 , and power switch tube Q32 and power switch tube Q33 share drive signal 6 .

As shown in FIG. 4 , as a fourth embodiment of the present invention, the main circuit of the combined converter includes a full-bridge module circuit with full-wave circular cross-rectification on the secondary side of three transformers. Full-bridge bridge circuit Hp1, DC blocking capacitor C1, high-frequency isolation transformer T1 with center tap on the secondary side and full-wave rectifier circuit re1 constitute the first circuit module; full-bridge bridge circuit Hp2, DC blocking capacitor C2, secondary High-frequency isolation transformer T2 with center tap and full-wave rectification circuit re2 constitute the second circuit module; full-bridge bridge circuit Hp3, DC blocking capacitor C3, high-frequency isolation transformer T3 with center tap on the secondary side and full-wave rectification circuit re3 constitutes the third circuit module; the output loops of the rectifier circuits re1, re2, re3 are cross-connected to the output filter inductors L1, L2, L3. Since the internal structures of the three circuit modules are the same, for the convenience of explanation, only the internal structure of one of the circuit modules is described below:

The full-bridge circuit Hp1 is composed of switching tubes Q11, Q12, Q13, and Q14. The switching tubes Q11, Q12, Q13, and Q14 are metal oxide silicon field-effect transistors (MOSFEETs). The source of the upper MOSFET of the bridge arm is connected to the drain of the lower MOSFET. , that is, the source of Q11 is connected to the drain of Q12, and the source of Q13 is connected to the drain of Q14. Connect the drains of the upper transistors Q13 and Q11 of the bridge arm as the positive pole of the input terminal, and connect the sources of the lower transistors Q14 and Q12 of the bridge arm as the negative pole of the input terminal. The midpoint of the bridge arm composed of two sets of switch tubes is taken out as the output port of the full bridge circuit. The high-frequency isolation transformer T1 has a single winding on the primary side and a double winding on the secondary side with a center tap. The primary port of the high frequency isolation transformer T1 is connected in series with the DC blocking capacitor C1 to the output port of the full bridge circuit Hp1. The full-wave rectification circuit re1 is composed of two rectification diodes: the anodes of the rectification diodes D11 and D12 are used as input ports of the rectification circuit, and are respectively connected to the secondary ports of the high-frequency isolation transformer. The anode of the diode D13 is connected to the center tap of the high frequency isolation transformer, and the cathode of the diode D13 is connected to the cathode of the diode D11. The cathodes of the rectifier diodes D11 and D12 are used as the positive output ports 1 and 2 of the full-wave rectification circuit re1 respectively, and the center tap of the secondary side of the high-frequency isolation transformer T1 is used as the negative output port of the full-wave rectification circuit re1. The positive output port 1 of the full-wave rectification circuit re1 is connected to the output filter inductor L1, and the positive output port 2 of the full-wave rectification circuit re1 is connected to the output filter inductor L2 of the second module. The port connecting the high-frequency isolation transformer T1 to the source of the power switching tube Q11 and the drain of the power switching tube Q12 is marked as port 1, and the port connecting the high-frequency isolation transformer T1 to the anode of the diode D11 is marked as port 2. High-frequency isolation The port where the transformer T1 is connected to the anode of the diode D12 is marked as port 3, then port 1 and port 2 are a group of terminals with the same name of the high-frequency isolation transformer T1, and ports 1 and 3 are a group of terminals with the same name of the high-frequency isolation transformer T1.

The grid and source of each power switch tube are led out to connect to the driving signal. Power switch tube Q11, power switch tube Q14 share drive signal 1, power switch tube Q12, power switch tube Q13 share drive signal 2, power switch tube Q21, power switch tube Q24 share drive signal 3, power switch tube Q22, power switch tube Q23 shares drive signal 4 , power switch tube Q31 and power switch tube Q34 share drive signal 5 , and power switch tube Q32 and power switch tube Q33 share drive signal 6 .

The power switches in the above four implementations are generally Metal Oxide Semiconductor Field-effect Transistor (MOSFET) or Insulated Gate Bipolar Transistor (IGBT). The capacitors in the first and second implementation manners are either polarized electrolytic capacitors, or non-polarized capacitors, or a combination of both. The DC blocking capacitors in the third and fourth implementation manners are non-polar capacitors.

As shown in Figure 5, in the present invention, the three circuit modules adopt a common duty ratio control mode, and a total of six driving signals are used, which are respectively driving signal 1, driving signal 2, driving signal 3, driving signal 4, and driving signal 5. , Drive signal 6 . The driving signal 1 and the driving signal 2 are interleaved by half a switching period, the driving signal 3 and the driving signal 5 are the same as the driving signal 1, and the driving signal 4 and the driving signal 6 are the same as the driving signal 2. The duty ratios of the driving signal 1 to the driving signal 6 are all less than 0.5. All power switch tubes work in coordination under the above six driving signals. Under the condition of circular cross rectification, natural current sharing between input and output is realized between each module circuit, and no current sharing control loop is needed.

n<N)个模块的整流电路正极输出端口2连接至第n+1个模块的输出滤波电感Ln+1, 第N个模块的整流电路正极输出端口2连接至第1个模块的输出滤波电感L1。这种方案能有效扩大直流变换器的输出电流等级，控制设计简单，可靠性高。 In the above-mentioned embodiment, the number of modules is 3, but the present invention is not limited thereto. When the number of modules is N (N>3), a combined converter composed of N modules with inputs connected in parallel and outputs connected in parallel can adopt a similar scheme to Realize the natural current sharing of input and output, that is, the nth(1

n<N) The positive output port 2 of the rectifier circuit of the module is connected to the output filter inductor Ln+1 of the n+1th module, and the positive output port 2 of the rectifier circuit of the Nth module is connected to the output filter inductor of the first module L1. This scheme can effectively expand the output current level of the DC converter, and the control design is simple and the reliability is high.

Claims (6)

1. a plurality of module combination converters of circular cross rectification, it is characterized in that, it is connected by several modules and forms, and each module is connected successively by bridge circuit, high-frequency isolation transformer, rectifier circuit and inductance and forms; Each module The input terminals of the bridge circuit are connected in parallel, and the output terminals of each inductor are connected in parallel. 2 . The multi-module combined converter for cyclic cross rectification according to claim 1 , wherein the bridge circuit is a full-bridge bridge circuit or a half-bridge bridge circuit. 3 . 3. According to claim 2, a plurality of modules combining converters for cyclic cross rectification, wherein the bridge circuit is a full-bridge bridge circuit, and the converter also includes a DC blocking capacitor, and the DC blocking capacitor It is connected between any bridge arm of the full-bridge bridge circuit and the primary side of the high-frequency isolation transformer. 4 . The multi-module combined converter for cyclic cross rectification according to claim 1 , wherein the rectification circuit is a full-bridge rectification circuit or a full-wave rectification circuit. 5. according to claim 4, the multi-module combination converter of circular cross rectification is characterized in that, the rectification circuit is a full-bridge rectification circuit, and the primary side and the secondary side of the high-frequency isolation transformer are single windings, and the full-bridge rectification circuit The bridge rectifier circuit includes four rectifier diodes D _1a -D _1d , wherein the anode of the rectifier diode D _1a is connected to the cathode of the rectifier diode D _{1c to form a bridge arm, and the anode of the rectifier diode D 1b is} connected to the cathode of the rectifier diode D _1d , forming another bridge arm, the anode of the rectifier diode D _1c is connected to the anode of the rectifier diode D _1d and grounded, the midpoint of the two bridge arms is connected to the secondary side of the high-frequency isolation transformer, and the cathode of the rectifier diode D _1a is defined as a full bridge The first output port of the rectifier circuit, the cathode of the rectifier diode D _1b is the second output port of the full bridge rectifier circuit; the first output port of the full bridge rectifier circuit of each module is connected to the inductance of the module, the full bridge rectifier circuit of each module The second output port of the first module is connected to the inductance of the next module, and the second output port of the full-bridge rectifier circuit of the last module is connected to the inductance of the first module. 6. according to claim 4, the multi-module combination converter of cyclic cross rectification is characterized in that, the rectification circuit is a full-wave rectification circuit, the primary side single winding of the high frequency isolation transformer, the secondary side double winding and the band center tap, the full-wave rectification circuit includes three diodes D ₁₁ -D ₁₃ , the anodes of diode D ₁₁ and diode D ₁₂ are respectively connected to the secondary side of the high-frequency isolation transformer, and the anode of diode D ₁₃ is connected to the center tap of the high-frequency isolation transformer and grounded , the cathode of diode D ₁₃ is connected to the cathode of diode D ₁₁ ; the cathode of diode D ₁₁ is defined as the first output port of the full-wave rectification circuit, and the cathode of diode D ₁₂ is the second output port of the full-wave rectification circuit; the full-wave rectification circuit of each module The first output port of the wave rectification circuit is connected to the inductance of the module, the second output port of the full-wave rectification circuit of each module is connected to the inductance of the next module, and the second output port of the full-wave rectification circuit of the last module is connected to the first module inductance.

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