A single-phase double-voltage interleaved parallel power correction circuit

Abstract

A single-phase voltage-doubler interleaved parallel power correction circuit, the correction circuit comprising an AC power supply U g , inductance L1, inductance L2, diode D1-D8, switch S1-S2, capacitor C1, capacitor C2, capacitor C3, load R L ; switch capacitor C3, capacitor C1, diode D7, diode D8 are connected to constitute a switch capacitor circuit, forming a voltage doubling structure. The present application combines the advantages of single-phase interleaved parallel technology and voltage-doubler rectifier circuit, through multiple power converter units interleaved parallel operation, and adopts voltage-doubler rectifier circuit to realize voltage multiplication. Compared with the traditional rectifier, this technology can effectively reduce the voltage stress of power devices, input current THD and the size of EMI filter through multiple power converter units interleaved parallel operation, thereby improving the overall performance and reliability of the system. At the same time, the voltage-doubler rectifier circuit can also be designed and adjusted according to the needs to adapt to different input and output voltage requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to a single-phase rectifier, in particular to a single-phase double-voltage interleaved parallel power correction circuit. BACKGROUND

[0002] With the continuous development of modern electronic technology, as the core component in power conversion, the performance and application range of rectifiers are also constantly improving and expanding. Although traditional rectifiers are widely used in power conversion, they have problems such as low working efficiency and large output voltage fluctuation. SUMMARY

[0003] The present application provides a single-phase double-voltage interleaved parallel power correction circuit, which can make the circuit have low voltage stress on the switch, thereby reducing cost and switch loss. Compared with traditional boost converters, the correction circuit cannot provide high voltage gain due to parasitic resistance in the circuit. The correction circuit combines the advantages of single-phase interleaved parallel technology and double-voltage rectifier circuit, and realizes voltage multiplication through multiple power converter units operating in interleaved parallel mode and using double-voltage rectifier circuit.

[0004] The technical scheme adopted by the present application is:

[0005] A single-phase double-voltage interleaved parallel power correction circuit, the circuit comprising:

[0006] inductance L1, inductance L2, diode D1-D8, switch tube S1-S2, capacitor C1, capacitor C2, capacitor C3, load R L ;

[0007] One end of the alternating current power supply U g is connected to the anode of diode D1 and the cathode of diode D3, respectively, and the connection node constitutes node a;

[0008] The other end of the alternating current power supply U g is connected to the anode of diode D2 and the cathode of diode D4, respectively, and the connection node constitutes node b;

[0009] The cathode of diode D1 is connected to the cathode of diode D2, one end of inductance L1, and one end of inductance L2, respectively, and the connection node constitutes node c;

[0010] The anode of diode D3 is connected to the anode of diode D4, the source of switch tube S1, the source of switch tube S2, the negative electrode of capacitor C2, and the other end of load R L , respectively, and the connection node constitutes node d;

[0011] The other end of inductance L1 is connected to the drain of switch tube S1, the anode of diode D5, and one end of capacitor C3, respectively, and the connection node constitutes node h;

[0012] The other end of the inductor L2 is connected to the drain of the switch S2 and the anode of the diode D6, and the connection node constitutes a node g; the node g is connected to a node h;

[0013] The cathode of the diode D5 is connected to the cathode of the diode D6, the anode of the diode D8, the other end of the capacitor C1, and one end of the capacitor C2, and the connection node constitutes a node o;

[0014] The other end of the capacitor C3 is connected to the anode of the diode D7 and the cathode of the diode D8, and the connection node constitutes a node e;

[0015] The cathode of the diode D7 is connected to one end of the capacitor C1 and one end of the load R L , and the connection node constitutes a node p.

[0016] The switch capacitor C3, the capacitor C1, the diode D7, and the diode D8 are connected to constitute a switch capacitor circuit, forming a voltage doubler structure.

[0017] The single-phase voltage doubler interleaved parallel power correction circuit includes six working modes:

[0018] Mode 1: the switch S2 is off, the switch S1 is on, the current flows through the inductor L1, and returns to the AC power supply U g after the switch S1; at this time, the AC power supply U g charges the inductor L1; the inductor L2 charges the capacitor C2 and the load R L through the diode D6 at the same time; the capacitor C3 charges the capacitor C1 through the diode D7; the current in the inductor L1 starts to linearly rise, and the current in the inductor L2 continues to drop;

[0019] Mode 2: the switch S2 continues to be off, the switch S1 continues to be on, the current flows through the inductor L1, and returns to the AC power supply U g after the switch S1; at this time, the AC power supply U g continues to charge the inductor L1; the capacitor C2 charges the capacitor C3 through the diode D8; the current in the inductor L2 has dropped to 0, and the current in the inductor L1 continues to rise;

[0020] Mode 3: the switches S1 and S2 are both off, the inductor L1 discharges to the load R L and the capacitor C2 through the diode D5; the inductor L2 discharges to 0; the capacitor C3 charges the capacitor C1 through the diode D7; the current in the inductor L1 starts to linearly drop, and the current in the inductor L2 continues to be 0;

[0021] Mode 4: the switch S1 is off, the switch S2 is on, the current flows through the inductor L2, and returns to the AC power supply U g after the switch S2; at this time, the AC power supply U gInductor L2 is charged; inductor L1 charges capacitor C1 through diode D7; the current in inductor L1 continues to linearly decrease, and the current in inductor L2 starts to linearly increase. L Inductor L2 is charged; inductor L1 charges capacitor C1 through diode D7; the current in inductor L1 continues to linearly decrease, and the current in inductor L2 starts to linearly increase.

[0022] Mode 5: switch tube S1 continues to be turned off, S2 continues to be turned on, current flows through inductor L2, and switch tube S2 returns to AC power supply U g ; at this time, AC power supply U g continues to charge inductor L2; capacitor C2 charges capacitor C3 through diode D8; the current in inductor L1 decreases to 0, and the current in inductor L2 continues to increase.

[0023] Mode 6: switch tubes S1 and S2 are all turned off, inductor L2 charges capacitor C2 and capacitor C1 through diode D6 at the same time. L ; at this time, AC power supply U dc continues to charge inductor L2; capacitor C2 charges capacitor C3 through diode D8; the current in inductor L1 decreases to 0, and the current in inductor L2 continues to increase.

[0024] In the six working modes, the capacitor voltages U1=U2=1 / 2U dc .

[0025] The single-phase interleaved parallel power correction circuit has the following beneficial effects:

[0026] 1. The power correction circuit itself has the functions of voltage boosting and rectification. Through the basic principle of voltage doubling and rectification, the novel single-phase interleaved parallel voltage doubling power correction circuit can multiply the input single-phase alternating voltage by several times.

[0027] 2. The power correction circuit adopts a switched capacitor circuit to form a voltage doubling structure, thereby achieving voltage multiplication and having the advantages of high efficiency, stability, flexibility, etc. Meanwhile, the power correction circuit can be designed and adjusted as needed to adapt to different input and output voltage requirements.

[0028] 3. The interleaved parallel design enables the rectification units to work in turn, thereby effectively dispersing the current load and reducing the current stress of a single rectification unit. This not only improves the overall working efficiency of the power correction circuit, but also prolongs the service life of the rectification unit. BRIEF DESCRIPTION OF DRAWINGS

[0029] The application will be further described below in conjunction with the drawings and embodiments:

[0030] Figure 1 is a circuit principle diagram of the single-phase interleaved parallel voltage doubling power correction circuit.

[0031] Figure 2Current path schematic diagram for single-phase interleaved parallel voltage doubler rectifier working mode 1;

[0032] Figure 3 Current path schematic diagram for single-phase interleaved parallel voltage doubler rectifier working mode 2;

[0033] Figure 4 Current path schematic diagram for single-phase interleaved parallel voltage doubler rectifier working mode 3;

[0034] Figure 5 Current path schematic diagram for single-phase interleaved parallel voltage doubler rectifier working mode 4;

[0035] Figure 6 Current path schematic diagram for single-phase interleaved parallel voltage doubler rectifier working mode 5;

[0036] Figure 7 Current path schematic diagram for single-phase interleaved parallel voltage doubler rectifier working mode 6;

[0037] Figure 8 Input voltage U g and current i g waveform diagram of single-phase interleaved parallel voltage doubler rectifier.

[0038] Figure 9 Output DC voltage U dc waveform diagram of single-phase interleaved parallel voltage doubler rectifier.

[0039] Figure 10 Output DC voltage U dc waveform diagram of single-phase interleaved parallel voltage doubler rectifier when load is halved. DETAILED DESCRIPTION

[0040] As shown in Figure 1 , a single-phase voltage-doubler interleaved parallel power correction circuit includes: an AC power source U g , an inductor L1, an inductor L2, diodes D1-D8, switch tubes S1-S2, a capacitor C1, a capacitor C2, a capacitor C3, and a load R L .

[0041] One end of the power source U g is connected to the anode of diode D1 and the cathode of diode D3, and is commonly connected to node a;

[0042] The other end of the power source U g is connected to the anode of diode D2 and the cathode of diode D4, and is commonly connected to node b;

[0043] The cathode of diode D1 is connected to the cathode of diode D2 and one end of inductors L1 and L2, and is commonly connected to node c;

[0044] Anode of diode D3 is connected with anode of diode D4, source of switch tube S1 and S2, negative pole of capacitor C2 and one end of load R L , and is commonly connected to node d;

[0045] The other end of inductor L1 is connected with drain of switch tube S1, anode of diode D5 and negative pole of capacitor C3, and is commonly connected to node h;

[0046] The other end of inductor L2 is connected with drain of switch tube S2 and anode of diode D6, and is commonly connected to node g, and node g is connected with node h;

[0047] Kathode of diode D5 is connected with kathode of diode D6, anode of diode D8, negative pole of capacitor C1 and positive pole of capacitor C2, and is commonly connected to node o;

[0048] Anode of diode D7 is connected with kathode of diode D8 and positive pole of capacitor C3, and is commonly connected to node e;

[0049] Kathode of diode D7 is connected with positive pole of capacitor C1 and the other end of load R L , and is commonly connected to node p;

[0050] The switch capacitor C3, capacitor C1, diode D7 and diode D8 constitute a switch capacitor circuit, forming a voltage doubling structure.

[0051] The following describes the working principle of the single-phase voltage-doubled interleaved parallel power correction circuit of the circuit, and the single-phase interleaved parallel voltage doubler has six working modes, and the specific analysis process is as follows:

[0052] Figure 2 The current path schematic diagram for mode 1 is as follows: switch tube S2 is off, S1 is on, current flows through inductor L1, and returns to power supply U g after switch tube S1; at this time, power supply U g charges inductor L1; inductor L2 charges load R L and capacitor C2 through diode D6; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 linearly rises from zero, and the current in inductor L2 continues to drop;

[0053] Figure 3 The current path schematic diagram for mode 2 is as follows: switch tube S2 continues to be off, S1 continues to be on, current flows through inductor L1, and returns to power supply U g after switch tube S1; at this time, power supply U g continues to charge inductor L1; capacitor C2 charges capacitor C3 through diode D8; the current in inductor L2 has dropped to 0, and the current in inductor L1 continues to rise.

[0054] Figure 4 For the mode 3 current path schematic: switch S1, S2 are all off, inductance L1 through diode D5 to the load R L , capacitor C2 discharge; inductance L2 discharge is zero; capacitor C3 through diode D7 to charge capacitor C1; inductance L1 in the current begins to linearly decline, inductance L2 in the current continues to be 0.

[0055] Figure 5 For the mode 4 current path schematic: switch S1 is off, S2 is on, current flows through inductance L2, switch S2 after returning to the power supply U g ; at this time the power supply U g charges inductance L2; inductance L1 through diode D5 charges the load R L and capacitor C2; capacitor C3 charges capacitor C1 through diode D7; inductance L1 in the current continues to linearly decline, inductance L2 in the current begins to linearly rise;

[0056] Figure 6 For the mode 5 current path schematic: switch S1 continues to be off, S2 continues to be on, current flows through inductance L2, switch S2 after returning to the power supply U g ; at this time the power supply U g continues to charge inductance L2; capacitor C2 charges capacitor C3 through diode D8; inductance L1 in the current declines to 0, inductance L2 in the current continues to rise.

[0057] Figure 7 For the mode 6 current path schematic: switch S1, S2 are all off, inductance L2 through diode D6 charges the load R L , capacitor C2; capacitor C3 charges capacitor C1 through diode D7; inductance L1 in the current continues to be 0, inductance L2 in the current begins to linearly decline.

[0058] Table 1 is a rectifier switch pulse distribution mode, DC side inductance, capacitor working state correspondence table, wherein the conduction and turn-off of the switch are represented by "1" and "0" respectively, and inductance discharge to zero is represented by "0".

[0059] Table 1 is a rectifier switch pulse distribution mode, DC side inductance, capacitor working state correspondence table

[0060]

[0061] In order to verify that the single-phase double-voltage interleaved parallel power correction circuit can realize the double-voltage function, under the PR control strategy, the experimental verification is carried out, and the experimental parameters are: input voltage effective value 220V, working frequency 50Hz, two equivalent inductances 8.5mH, switch capacitor 400uF, two output capacitors 4000uF, switch frequency 20kHz, and load 160Ω.

[0062] Figure 8 For the single-phase interleaved parallel double-voltage rectifier input voltage U g and current i g Waveform diagram, the present application controls the conduction and turn-off of the switching converter, so that the input current waveform is as close to a sine wave as possible, which can further reduce the harmonic content of the grid-side current, as shown in Figure 8 Waveform, the voltage and current are in the same phase, that is, the power factor correction function is realized.

[0063] Figure 9 For the single-phase interleaved parallel double-voltage rectifier output DC voltage U dc Waveform diagram, the present application designs a single-phase interleaved parallel double-voltage rectifier with input 220V and output 800V, which is Figure 9 Waveform, the voltage U dc is doubled.

[0064] Figure 10 For the single-phase interleaved parallel double-voltage rectifier output DC voltage U dc Waveform diagram, the output DC voltage U dc Waveform is slightly adjusted at 0.4s-0.5s and quickly recovers to a stable state, indicating that the single-phase interleaved parallel double-voltage rectifier has strong dynamic regulation capability and good disturbance rejection performance.

[0065] The single-phase double-voltage interleaved parallel power correction circuit combines the advantages of single-phase interleaved parallel technology and double-voltage rectifier circuit, realizes voltage multiplication through multiple power converter units operating in interleaved parallel mode, and adopts a double-voltage rectifier circuit. This new type of rectifier circuit not only has the characteristics of high efficiency, stability and flexibility, but also can be designed and adjusted according to the needs to adapt to different input and output voltage requirements.

[0066] The present application combines the advantages of single-phase interleaved parallel technology and double-voltage rectifier circuit, realizes voltage multiplication through multiple power converter units operating in interleaved parallel mode, and adopts a double-voltage rectifier circuit. Compared with the traditional rectifier, the technology realizes voltage stress reduction of power devices, input current THD and EMI filter size through multiple power converter units operating in interleaved parallel mode, thereby improving the overall performance and reliability of the system. At the same time, the double-voltage rectifier circuit can be designed and adjusted according to the needs to adapt to different input and output voltage requirements.

Claims

1. A single-phase voltage-doubling interleaved parallel power correction circuit, characterized in that The circuit includes: inductance L 1. Inductor L 2. Diodes D1~D8, switch tube S 1~ S 2. Capacitor C 1. Capacitor C 2. Capacitor C 3. Load R L ; AC power supply U g One end of each is connected to the anode of diode D1 and the cathode of diode D3, and the connection node forms a node a ; AC power supply U g The other end is connected to the anode of diode D2 and the cathode of diode D4, and the connection node forms a node b ; The cathode of diode D1 is connected to the cathode of diode D2, the inductor L One end of 1, inductor L 2, whose connected nodes form a node c ; The anode of diode D3 is connected to the anode of diode D4 and the anode of switch tube S 1's source, switch tube S 2 source, capacitor C 2 negative pole, load R L The other end of its connection node constitutes a node d ; inductance L The other end of 1 is connected to the switch tube S 1's drain, the anode of diode D5, and the capacitor C 3, whose connected nodes form a node h ; inductance L The other end of 2 is connected to the switch tube S 2, the anode of diode D6, and their connection node constitutes node g ;node g Connecting Nodes h ; The cathode of diode D5 is connected to the cathode of diode D6, the anode of diode D8, and the capacitor C The other end of 1, capacitor C 2, whose connected nodes form a node o ; capacitance C The other end of 3 is connected to the anode of diode D7 and the cathode of diode D8, and the connection node forms node e ; The cathode of diode D7 is connected to capacitor C One end of 1, load R L One end of the node, its connected nodes constitute the node p ; The power correction circuit includes 6 working modes: Mode 1: Switching tube S 2 off, S 1 is on, current flows through the inductor L 1. Switching tube S 1 after returning to AC power U g ; At this time, the AC power U g Directional Inductance L 1 Charging; Inductance L 2. Through diode D6, the capacitor C 2. Load R L charging; capacitor C 3 through the diode D7 to the capacitor C 1 Charging; Inductance L The current in 1 starts to rise linearly from zero, and the inductor L The current in 2 continues to decrease; Mode 2: Switching tube S 2 Continue to shut down, S 1 continues to conduct, current flows through the inductor L 1. Switching tube S 1 after returning to AC power U g ; At this time, the AC power U g Continue to inductor L 1 Charging; Capacitor C 2 through the diode D8 to the capacitor C 3. Charging; Inductance L The current in 2 has dropped to 0, the inductor L The current in 1 continues to rise; Mode 3: Switching tube S 1. S 2 All off, inductor L 1 to the load through diode D5 R L ,capacitance C 2 discharge; inductance L 2 discharge to zero; capacitance C 3 through the diode D7 to the capacitor C 1 Charging; Inductance L The current in 1 starts to decrease linearly, and the inductor L The current in 2 continues to be 0; Mode 4: Switching tube S 1 off, S 2 is turned on, current flows through the inductor L 2. Switching tube S 2 after returning to AC power U g ; At this time, the AC power U g Directional Inductance L 2 Charging; Inductance L 1 to the load through diode D5 R L and capacitors C 2 Charging; Capacitor C 3 through the diode D7 to the capacitor C 1 Charging; Inductance L The current in 1 continues to decrease linearly, and the inductor L The current in 2 begins to rise linearly; Mode 5: Switching Tube S 1 Continue to shut down, S 2 continues to conduct, and current flows through the inductor L 2. Switching tube S 2 after returning to AC power U g ; At this time, the AC power U g Continue to inductor L 2 Charging; Capacitor C 2 through the diode D8 to the capacitor C 3. Charging; Inductance L 1 the current drops to 0, the inductor L The current in 2 continues to rise; Mode 6: Switching Tube S 1. S 2 All off, inductor L 2. Simultaneously supply power to the load through diode D6. R L ,capacitance C 2 Charging; Capacitor C 3 through the diode D7 to the capacitor C 1 Charging; Inductance L The current in 1 continues to be 0, the inductor L The current in 2 begins to decrease linearly.

2. The single-phase voltage-doubling interleaved parallel power correction circuit according to claim 1, characterized in that: The capacitor C 3. Capacitor C 1. Diode D7 and diode D8 are connected to form a switched capacitor circuit, forming a voltage doubling structure.

3. The single-phase voltage-doubling interleaved parallel power correction circuit according to claim 1, characterized in that: In the 6 working modes, the capacitor voltage U 1= U 2=1 / 2 U dc .

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