A single-phase single-tube bidirectional switch hybrid two-level rectifier

Abstract

A single-phase single-tube bidirectional switch hybrid two-level rectifier, comprising an alternating current power supply v in , uncontrolled diode bridge arms D1~D4, diodes D5~D 12 , inductance L , inductance L 1, inductance L 2, switching tube S 1, switching tube S a , capacitor C , resistance R . Among them, diodes D5~D 10 , switching tube S 1 constitutes a set of single-tube bidirectional switch units. The hybrid rectifier can realize flexible allocation of energy between two parallel rectifiers, so that the system energy efficiency is further optimized. A new type of single-phase single-tube bidirectional switch hybrid two-level rectifier proposed in the application has the characteristics of high efficiency and high power density compared with the traditional single-phase rectifier, reduces the device rating and loss, and greatly improves the working efficiency of the circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to a two-level rectifier, in particular to a single-phase single-tube bidirectional switch hybrid two-level rectifier. BACKGROUND

[0002] Under the background of rapid development of power electronics technology, power conversion technology has become an indispensable part of modern power systems. With the widespread application of renewable energy and the increasing demand for electricity, traditional power conversion technology is facing a series of challenges such as low efficiency, high cost, and large size. Therefore, the research and development of high-efficiency, compact power conversion equipment have become an important issue in the field of power electronics.

[0003] Modern power electronic devices have higher requirements for weight and size, and the shortcomings of traditional rectifiers in these aspects make it difficult to meet the needs of new applications. New hybrid rectifiers use more compact designs, significantly reducing size and weight while improving overall system efficiency through rational layout and the use of advanced materials. This design not only suits home and industrial fields, but also provides strong support for emerging markets such as electric vehicles, wind power generation, and photovoltaic power generation. In addition, compared with traditional rectifiers, new single-tube hybrid rectifiers improve the accuracy of current control and voltage regulation through optimized control strategies, greatly improving the dynamic response capability of the system. SUMMARY

[0004] The present application proposes a single-phase single-tube bidirectional switch hybrid two-level rectifier, which has the advantages of simple structure, low cost, and flexible control. Using a single switch tube through precise control strategy, it realizes high efficiency and high stability of power conversion. It combines traditional rectifier circuits and modern control technology, not only achieving efficient rectification of DC power, but also maintaining high efficiency and stability of output under different load conditions, thereby improving the adaptability and flexibility of electric energy.

[0005] The technical scheme adopted by the present application is:

[0006] A single-phase single-tube bidirectional switch hybrid two-level rectifier, the hybrid rectifier comprises:

[0007] uncontrolled diode bridge arms D1-D4, diodes D5-D 12 , inductor L , inductor L 1, inductor L 2, switch tube S 1, switch tube S a , capacitor C , resistor R ;

[0008] AC power supply vin One side is connected to the anode of diode D1, the cathode of diode D2, and the inductor L One end of the AC power supply v in The other side is grounded;

[0009] The cathode of diode D1 and the cathode of diode D3 are both connected to the inductor one end;

[0010] The anodes of diode D2 and diode D4 are both connected to the inductor one end;

[0011] The anode of diode D3 and the cathode of diode D4 are both grounded;

[0012] inductance L The other end is connected to the anode of diode D5 and the cathode of diode D6 respectively, and the connection node thereof constitutes node a;

[0013] The cathode of diode D5 is connected to the anode of diode D7 and the switching tube S 1's drain, diode D9's cathode;

[0014] The anode of diode D6 is connected to the cathode of diode D8 and the switching tube S 1's source, diode D 10 anode;

[0015] The anode of diode D9, diode D 10 The cathodes of are all grounded, and their connection node constitutes node n;

[0016] inductance The other end of each diode is connected to 11 Anode, switch tube drain;

[0017] inductance The other end is connected to the switch tube Source, diode D 12 cathode;

[0018] The cathode of diode D7 is connected to diode D 11 cathode, capacitor C One end of the load one end;

[0019] The anode of diode D8 is connected to diode D 12 Anode, capacitor C The other end of the load the other end.

[0020] The diodes D1, D2, D3, D4 are connected to constitute a non-controlled rectifier circuit.

[0021] The diodes D5~D 10 , the switch tube S 1 is connected to constitute a group of single-tube bidirectional switch units, which can realize the function of bidirectional current circulation.

[0022] A single-phase single-tube bidirectional switch hybrid two-level rectifier includes four working modes:

[0023] Mode 1: the switch tube S 1 is turned on, and the current flows through the inductor L , the diode D5, the switch tube S 1, the diode D 10 , and then returns to the AC power supply v in ; at this time, the AC power supply v in charges the inductor L to store energy, the inductor current linearly increases, and the load is powered by the capacitor C , and the voltage U an =0.

[0024] Mode 2: the switch tube S 1 is turned off, and the current flows through the inductor L , the diode D5, the diode D7, the capacitor C , the diode D8, and the diode D 10 , and then returns to the AC power supply v in ; at this time, the inductor L and the AC power supply v in charge the capacitor C at the same time, the inductor current linearly decreases, and the voltage U an = +v o .

[0025] Mode 3: the switch tube S 1 is turned on, and the current flows through the diode D9, the switch tube , the diode D6, and the inductor L , and then returns to the AC power supply v in ; at this time, the AC power supply v in charges the inductor L to store energy, the inductor current linearly increases, and the load is powered by the capacitor C , and the voltage U an =0.

[0026] Mode 4: switch tube S 1 off, current flows through diode D9, diode D7, capacitor C , diode D8, diode D6, inductor L Return to AC power supply v in ; at this time AC power v in and inductor L Charge the capacitor C , the inductor current decreases linearly, the voltage U an = -v o .

[0027] Using diode D 11 , D 12 can let the capacitor C current only to the load R flow, ensure the single-phase flow of power; at the same time, used as a boost clamp diode during mode switching.

[0028] In the four working modes, the capacitor voltage v c =v o .

[0029] The single-phase single-tube bidirectional switch hybrid two-level rectifier has the following advantages:

[0030] 1. Using a single switch tube through precise control strategy, high efficiency and high stability of power conversion is realized. It combines traditional rectifier circuit and modern control technology, which can not only realize high efficiency rectification of DC power supply, but also can maintain high efficiency and stability output under different load conditions, thereby improving the adaptability and flexibility of electric energy.

[0031] 2. Compared with the traditional multi-phase system, the structure reduces the number of components, simplifies the control and implementation difficulty. And it can handle different load conditions in a wide range, while ensuring high efficiency conversion of electric energy, which can be applied in many scenes.

[0032] 3. The new single-phase single-tube bidirectional switch hybrid two-level structure can realize flexible allocation of energy between two parallel rectifiers, further optimizing the system energy efficiency. Compared with traditional single-phase rectifiers, it has high efficiency, high power density and other characteristics, reduces device rating and loss, greatly improves the working efficiency of the circuit. BRIEF DESCRIPTION OF DRAWINGS

[0033] The application will be further described below in conjunction with the drawings and examples:

[0034] Figure 1 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit.

[0035] Figure 2 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit.

[0036] Figure 3 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit.

[0037] Figure 4 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit.

[0038] Figure 5 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit.

[0039] Figure 6 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. v in A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. i

[0040] Figure 7 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. v in A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. i

[0041] Figure 8 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. v in A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. i in A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit.

[0042] Figure 9 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. U an A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit.

[0043] Figure 10 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. R v o A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit.

[0044] Figure 11 A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. R v o A schematic diagram of a novel single-phase single-switch bidirectional hybrid two-level rectifier circuit. ​​​​DETAILED DESCRIPTION

[0045] As Figure 1 shown in the figure, a single-phase single-tube bidirectional switch hybrid two-level rectifier, the hybrid rectifier comprises:

[0046] uncontrolled diode bridge arms D1-D4, diodes D5-D 12 , inductors L , inductors L 1, inductors L 2, switching tubes S 1, switching tubes S a , capacitors C , resistors R ;

[0047] AC power supply v in One side of the AC power supply is connected to the anode of diode D1, the cathode of diode D2, and one end of inductor L The other side of the AC power supply is grounded. v in

[0048] The cathode of diode D1 and the cathode of diode D3 are connected to one end of inductor .

[0049] The anode of diode D2 and the anode of diode D4 are connected to one end of inductor .

[0050] The anode of diode D3 and the cathode of diode D4 are grounded.

[0051] The other end of inductor L is connected to the anode of diode D5 and the cathode of diode D6, respectively, and the connection node constitutes node a.

[0052] The cathode of diode D5 is connected to the anode of diode D7, the drain of switching tube S 1, and the cathode of diode D9, respectively.

[0053] The anode of diode D6 is connected to the cathode of diode D8, the source of switching tube S 1, and the anode of diode D 10 , respectively.

[0054] The anode of diode D9 and the cathode of diode D 10 are both grounded, and the connection node constitutes node n.

[0055] The other end of inductor is connected to the anode of diode D 11 and the drain of switching tube , respectively. ​

[0056] inductor The other end of the inductor is connected to the switch tube source, diode D 12 cathode;

[0057] The cathode of diode D7 is connected to the cathode of diode D 11 , one end of the capacitor C , one end of the load .

[0058] The anode of diode D8 is connected to the anode of diode D 12 , the other end of the capacitor C , the other end of the load .

[0059] The diodes D1, D2, D3, and D4 are connected to form a non-controlled rectifier circuit.

[0060] The diodes D5-D 10 and the switch tube S 1 form a single-tube bidirectional switch unit, which can realize the function of bidirectional current flow.

[0061] The specific working principle of the new single-phase single-tube bidirectional switch hybrid two-level rectifier circuit is described below. The two-level rectifier has four working modes, including the capacitor voltage v c =v o The specific analysis process is as follows:

[0062] Figure 2 The current path diagram for mode 1 is shown in the figure. The switch tube S 1 is turned on, and the current flows through the inductor L , diode D5, switch tube S 1, diode D 10 , and then returns to the power supply v in ; At this time, the power supply v in charges the inductor L to store energy, and the inductor current increases linearly. The load is powered by the capacitor C , and the voltage U an = 0;

[0063] Figure 3 The current path diagram for mode 2 is shown in the figure. The switch tube S 1 is turned off, and the current flows through the inductor L , diode D5, diode D7, capacitor C , diode D8, diode D 10After returning to the power supply v in ; at this time the inductor L is charged, the inductor current linearly decreases, and the voltage v in across the capacitor is 0. C U an = +v o ;

[0064] Figure 4 is a schematic diagram of the current path in mode 3: switch tube S 1 is turned on, the current flows through diode D9, switch tube D6, inductor L , and then returns to the power supply v in ; at this time the inductor v is charged, the inductor current linearly increases, and the voltage L across the capacitor is 0. C in = 0. U an

[0065] Figure 5 is a schematic diagram of the current path in mode 4: switch tube S 1 is turned off, the current flows through diode D9, diode D7, capacitor C , diode D8, diode D6, inductor L , and then returns to the power supply v in ; at this time the inductor v is charged, the inductor current linearly decreases, and the voltage L across the capacitor is 0. C in = 0. U an ; -v o ;

[0066] Table 1 is a correspondence table of the pulse distribution mode of the rectifier switch tube, the working state of the DC side capacitor, and the voltage U an corresponding to each other, wherein the turn-on and turn-off of the switch tube are represented by "1" and "0", respectively.

[0067] Table 1 is a correspondence table of the pulse distribution mode of the rectifier switch tube, the working state of the DC side capacitor, and the voltage U an corresponding to each other

[0068]

[0069] ​​​To verify the new single-phase single-tube mixed two-level rectifier can realize two-level function, under the single cycle control strategy, experimental verification is carried out, and the experimental parameters are as follows: the frequency of AC power supply is 50Hz, the input voltage effective value is 220V, the inductance L= 50mH, the capacitance is 22000uF, the switching frequency is 10kHz, and the boost inductance L 1= L 2=2mH, the load .

[0070] Figure 6 The voltage of the new single-phase single-tube bidirectional switch mixed two-level rectifier circuit v in , the input current i 1 waveform diagram, the input current i 1 can effectively follow the AC input voltage v in , further reduces the harmonic content of the input side current, and realizes the power factor correction function.

[0071] Figure 7 The voltage of the new single-phase single-tube bidirectional switch mixed two-level rectifier circuit v in , the input current i 2 waveform diagram, the input current i 2 can effectively follow the AC input voltage v in , further reduces the harmonic content of the input side current, and realizes the power factor correction function.

[0072] Figure 8 The voltage of the new single-phase single-tube bidirectional switch mixed two-level rectifier circuit v in , the input current i in waveform diagram, the input current i in can effectively follow the AC input voltage v in , further reduces the harmonic content of the input side current, and realizes the power factor correction function.

[0073] Figure 9 The voltage of the new single-phase single-tube bidirectional switch mixed two-level rectifier circuit bridge arm U an waveform diagram, it can be seen that the voltage is positive and negative alternately, and is almost symmetrical, the two-level effect is good, and the experimental verification and theoretical analysis results are consistent. The two-level is that the output potential has 0, v o two kinds.

[0074] Figure 10Output DC voltage of new type single-phase single-tube bidirectional switch mixed two-level rectifier circuit v o The waveform chart shows that the two-level rectifier with input 220V and output 400V is designed, Figure 10 The waveform shows that the voltage v o is stable.

[0075] Figure 11 Output DC voltage of new type single-phase single-tube bidirectional switch mixed two-level rectifier circuit when load is halved v o The waveform chart shows that the output DC voltage v o The waveform is slightly adjusted at 0.25s~0.3s and quickly recovers to a stable state, indicating that the system has strong dynamic adjustment ability and good anti-disturbance performance.

[0076] The mixed rectifier can realize flexible allocation of energy distribution between two parallel rectifiers, so that the system energy efficiency is further optimized.

[0077] Compared with the traditional single-phase rectifier, the single-phase single-tube bidirectional switch mixed two-level rectifier has the characteristics of high efficiency and high power density, reduces the device rating and loss, and greatly improves the working efficiency of the circuit.

Claims

1. A single-phase single-tube bidirectional switch hybrid two-level rectifier, characterized in that The rectifier includes: Uncontrolled diode bridge arms D1~D4, diodes D5~D 12 ,inductance L ,inductance L 1. Inductor L 2. Switching tube S 1. Switching tube S a ,capacitance C ,resistance R ; AC power supply v in One side is connected to the anode of diode D1, the cathode of diode D2, and the inductor L One end of the AC power supply v in The other side is grounded; The cathode of diode D1 and the cathode of diode D3 are both connected to the inductor one end; The anodes of diode D2 and diode D4 are both connected to the inductor one end; The anode of diode D3 and the cathode of diode D4 are both grounded; inductance L The other end is connected to the anode of diode D5 and the cathode of diode D6 respectively, and the connection node thereof constitutes node a; The cathode of diode D5 is connected to the anode of diode D7 and the switching tube S 1's drain, diode D9's cathode; The anode of diode D6 is connected to the cathode of diode D8 and the switching tube S 1's source, diode D 10 anode; The anode of diode D9, diode D 10 The cathodes of are all grounded, and their connection node constitutes node n; inductance The other end of each diode is connected to 11 Anode, switch tube drain; inductance The other end is connected to the switch tube Source, diode D 12 cathode; The cathode of diode D7 is connected to diode D 11 cathode, capacitor C One end of the load one end; The anode of diode D8 is connected to diode D 12 Anode, capacitor C The other end of the load the other end; The rectifier includes 4 working modes: Mode 1: Switching tube S 1 is on, current flows through the inductor L , diode D5, switch tube S 1. Diode D 10 After returning to AC power v in ; At this time, the AC power v in Directional Inductance L Charging energy storage, inductor current increases linearly, load By capacitor C Power supply, voltage U an =0; Mode 2: Switching tube S 1 is off, current flows through the inductor L , diode D5, diode D7, capacitor C , diode D8, diode D 10 After returning to AC power v in ; At this time, the inductance L With AC power v in At the same time, the capacitor C Charging, the inductor current decreases linearly, the voltage U an = +v o ; Mode 3: Switching tube S 1 is turned on, current flows through diode D9, and the switch tube , diode D6, inductor L After returning to AC power v in ; At this time, the AC power v in Directional Inductance L Charging energy storage, inductor current increases linearly, load By capacitor C Power supply, voltage U an =0; Mode 4: Switching tube S 1 is turned off, current flows through diode D9, diode D7, capacitor C , diode D8, diode D6, inductor L After returning the AC power v in ; At this time, the AC power v in With inductor L Towards capacitance C Charging, the inductor current decreases linearly, the voltage U an = -v o .

2. The single-phase single-tube bidirectional switch hybrid two-level rectifier according to claim 1, characterized in that: The diodes D1 , D2 , D3 , and D4 are connected to form an uncontrolled rectifier circuit.

3. The single-phase single-tube bidirectional switch hybrid two-level rectifier according to claim 1, characterized in that: The diodes D5~D 10 , switch tube S 1 is connected to form a set of single-tube bidirectional switch units.

4. The single-phase single-transistor bidirectional switch hybrid two-level rectifier according to claim 1, characterized in that: Use diode D 11 、D 12 Capacitor C The current flows only to the load R flow, ensuring the single-phase flow of power; at the same time, during the mode switching process, it is used as a boost clamping diode.

5. The single-phase single-transistor bidirectional switch hybrid two-level rectifier according to claim 1, characterized in that: In the four working modes, the capacitor voltage v c =v o .

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