Single-phase voltage-multiplying interleaving power correction circuit

Abstract

The invention discloses a single-phase voltage-multiplying interleaving power correction circuit. The correction circuit comprises an alternating current power supply Ug, an inductor L1, an inductor L2, diodes D1 to D8, switching tubes S1 to S2, a capacitor C1, a capacitor C2, a capacitor C3 and a load RL, and the switched capacitor C3, the capacitor C1, the diode D7 and the diode D8 are respectively connected to form a switched capacitor circuit so as to form a voltage-multiplying structure. The advantages of the single-phase interleaving parallel technology and the voltage doubling rectifying circuit are combined, the multiple power converter units operate in an interleaving parallel mode, and voltage multiplication is achieved through the voltage doubling rectifying circuit. Compared with a traditional rectifier, the technology can effectively reduce the voltage stress of a power device, the input current THD and the size of an EMI filter through staggered parallel operation of a plurality of power converter units, thereby improving the overall performance and reliability of a system. Meanwhile, the voltage doubling rectifying circuit can be designed and adjusted according to requirements so as to adapt to different input and output voltage requirements.

Description

Technical Field

[0001] The invention relates to a single-phase rectifier, in particular to a single-phase voltage-doubling interleaved parallel power correction circuit. Background Art

[0002] With the continuous development of modern electronic technology, the performance and application scope of rectifiers, as the core components in power conversion, 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 fluctuations. Summary of the invention

[0003] The present invention proposes a single-phase voltage-doubling interleaved parallel power correction circuit, which can make the circuit have low voltage stress on the switch, thereby reducing cost and switching loss, compared with the traditional boost converter which 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 voltage-doubling rectifier circuit, operates through interleaved parallel operation of multiple power converter units, and adopts voltage-doubling rectifier circuit to achieve voltage doubling.

[0004] The technical solution adopted by the present invention is:

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

[0006] Inductor L1, inductor L2, diodes D1~D8, switches S1~S2, capacitors C1, C2, C3, load R L ;

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

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

[0009] The cathode of the diode D1 is respectively connected to the cathode of the diode D2, one end of the inductor L1, and one end of the inductor L2, and the connection node thereof constitutes a 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 load R L The other end of , its connected nodes constitute node d;

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

[0012] The other end of the inductor L2 is connected to the drain of the switch tube S2 and the anode of the diode D6 respectively, and the connection node thereof constitutes a node g; the node g is connected to the 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, respectively, and the connection nodes thereof constitute 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, respectively, and the connection node thereof constitutes a node e;

[0015] The cathode of diode D7 is connected to one end of capacitor C1 and load R L One end of , and its connected nodes constitute node p.

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

[0017] Single-phase voltage-doubling interleaved parallel power correction circuit, including 6 working modes:

[0018] Mode 1: Switch S2 is off, S1 is on, current flows through inductor L1, and then returns to AC power supply U after switching S1. g ; At this time, the AC power supply U g The inductor L1 is charged; the inductor L2 is charged to the capacitor C2 and the load R through the diode D6. L Charging; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 rises linearly from zero, and the current in inductor L2 continues to decrease;

[0019] Mode 2: Switch S2 continues to be turned off, S1 continues to be turned on, the current flows through the inductor L1, and then returns to the AC power supply U after the switch S1. g ; At this time, the AC power supply U g Continue to charge the inductor L1; capacitor C2 charges capacitor C3 through 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: Switches S1 and S2 are all turned off, and the inductor L1 is connected to the load R through the diode D5. L , capacitor C2 discharges; inductor L2 discharges to zero; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 begins to decrease linearly, and the current in inductor L2 continues to be 0;

[0021] Mode 4: Switch S1 is turned off, S2 is turned on, the current flows through the inductor L2, and then returns to the AC power supply U after the switch S2. g ; At this time, the AC power supply U gThe inductor L2 is charged; the inductor L1 is charged to the load R through the diode D5. L and capacitor C2; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 continues to decrease linearly, and the current in inductor L2 begins to increase linearly;

[0022] Mode 5: Switch S1 continues to be turned off, S2 continues to be turned on, the current flows through the inductor L2, and then returns to the AC power supply U after the switch S2. g ; At this time, the AC power supply U g Continue to charge the inductor L2; capacitor C2 charges capacitor C3 through diode D8; the current in the inductor L1 drops to 0, and the current in the inductor L2 continues to rise;

[0023] Mode 6: Switches S1 and S2 are all turned off, and inductor L2 supplies power to load R through diode D6. L , capacitor C2 is charged; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 continues to be 0, and the current in inductor L2 begins to decrease linearly.

[0024] In the 6 working modes, the capacitor voltage U1=U2=1 / 2U dc .

[0025] The present invention provides a single-phase voltage-doubling interleaved parallel power correction circuit, which has the following beneficial effects:

[0026] 1. The power correction circuit of the present invention itself has the functions of boosting and rectifying. Through the basic principle of voltage doubling rectification, the new single-phase interleaved parallel voltage doubling power correction circuit can increase the input single-phase AC voltage by several times.

[0027] 2. The power correction circuit of the present invention adopts a switched capacitor circuit to form a voltage doubling structure, which realizes voltage doubling and has the advantages of high efficiency, stability and flexibility. At the same time, the power correction circuit can also be designed and adjusted as needed to adapt to different input and output voltage requirements.

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

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

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

[0031] Figure 2It is a schematic diagram of the current path of the single-phase interleaved parallel voltage doubler rectifier in working mode 1;

[0032] Figure 3 It is a schematic diagram of the current path of the single-phase interleaved parallel voltage doubler rectifier in working mode 2;

[0033] Figure 4 It is a schematic diagram of the current path of the single-phase interleaved parallel voltage doubler rectifier in working mode 3;

[0034] Figure 5 It is a schematic diagram of the current path of the single-phase interleaved parallel voltage doubler rectifier in working mode 4;

[0035] Figure 6 It is a schematic diagram of the current path of the single-phase interleaved parallel voltage doubler rectifier in working mode 5;

[0036] Figure 7 It is a schematic diagram of the current path of the single-phase interleaved parallel voltage doubler rectifier in working mode 6;

[0037] Figure 8 The input voltage U of the single-phase interleaved parallel voltage doubler rectifier g and current i g Waveform graph.

[0038] Fig. 9 The output DC voltage U of the single-phase interleaved parallel voltage doubler rectifier dc Waveform graph.

[0039] Fig.10 The output DC voltage U of the single-phase interleaved parallel voltage doubler rectifier when the load is halved dc Waveform graph. DETAILED DESCRIPTION

[0040] like Figure 1 As shown, a single-phase voltage-doubling interleaved parallel power correction circuit includes: an AC power supply U g , inductor L1, inductor L2, diodes D1~D8, switch tubes S1~S2, capacitors C1, capacitors C2, capacitors C3, load R L ;

[0041] Power supply g One end of is respectively connected to the anode of diode D1 and the cathode of diode D3, and connected to node a together;

[0042] Power supply g The other end is connected to the anode of diode D2 and the cathode of diode D4 respectively, and connected to node b together;

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

[0044] The anode of diode D3 is connected to the anode of diode D4, the source of switch tubes S1 and S2, the negative electrode of capacitor C2, and the load R L are connected to one end of each other and are connected to node d;

[0045] The other end of the inductor L1 is respectively connected to the drain of the switch tube S1, the anode of the diode D5, and the negative electrode of the capacitor C3, and are connected together to the node h;

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

[0047] The cathode of the diode D5 is respectively connected to the cathode of the diode D6, the anode of the diode D8, the negative electrode of the capacitor C1, and the positive electrode of the capacitor C2, and are commonly connected to the node o;

[0048] The anode of the diode D7 is connected to the cathode of the diode D8 and the positive electrode of the capacitor C3 respectively, and they are connected together to the node e;

[0049] The cathode of diode D7 is connected to the positive electrode of capacitor C1 and the load R L The other end of is connected to the node p;

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

[0051] The specific working principle of a single-phase voltage-doubling interleaved parallel power correction circuit of the present invention is described below. The single-phase interleaved parallel voltage-doubling rectifier has 6 working modes. The specific analysis process is as follows:

[0052] Figure 2 This is a schematic diagram of the current path in mode 1: the switch tube S2 is turned off, S1 is turned on, the current flows through the inductor L1, and then returns to the power supply U after the switch tube S1 g ; At this time, the power supply U g The inductor L1 is charged; the inductor L2 is charged to the load R through the diode D6. L , capacitor C2 is charged; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 rises linearly from zero, and the current in inductor L2 continues to decrease;

[0053] Figure 3 This is a schematic diagram of the current path in mode 2: the switch tube S2 continues to be turned off, S1 continues to be turned on, the current flows through the inductor L1, and then returns to the power supply U after the switch tube S1 g ; At this time, the power supply U g The inductor L1 continues to be charged; 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.

[0054] Figure 4 This is a schematic diagram of the current path in mode 3: the switches S1 and S2 are all turned off, and the inductor L1 flows to the load R through the diode D5. L , capacitor C2 discharges; inductor L2 discharges to zero; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 begins to decrease linearly, and the current in inductor L2 continues to be 0.

[0055] Figure 5 This is a schematic diagram of the current path in mode 4: switch tube S1 is turned off, S2 is turned on, the current flows through the inductor L2, and then returns to the power supply U after the switch tube S2 g ; At this time, the power supply U g The inductor L2 is charged; the inductor L1 is charged to the load R through the diode D5. L and capacitor C2; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 continues to decrease linearly, and the current in inductor L2 begins to increase linearly;

[0056] Figure 6 This is a schematic diagram of the current path in mode 5: the switch tube S1 continues to be turned off, S2 continues to be turned on, the current flows through the inductor L2, and then returns to the power supply U after the switch tube S2 g ; At this time, the power supply U g The inductor L2 continues to be charged; the capacitor C2 charges the capacitor C3 through the diode D8; the current in the inductor L1 drops to 0, and the current in the inductor L2 continues to rise.

[0057] Figure 7 This is the current path diagram of mode 6: the switches S1 and S2 are all turned off, and the inductor L2 simultaneously supplies the current to the load R through the diode D6. L , capacitor C2 is charged; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 continues to be 0, and the current in inductor L2 begins to decrease linearly.

[0058] Table 1 is a corresponding relationship table of the pulse distribution mode of the rectifier switch tube, the DC side inductance, and the working state of the capacitor, where the on and off of the switch tube are represented by "1" and "0" respectively, and the inductor discharge is zero and represented by "0".

[0059] Table 1 Correspondence between the pulse distribution mode of the rectifier switch tube, the working state of the DC side inductor and capacitor

[0060]

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

[0062] Figure 8 The input voltage U of the single-phase interleaved parallel voltage doubler rectifier g and current i g Waveform diagram, the present invention controls the on and off of the switching converter to make the input current waveform as close to a sine wave as possible, which can further reduce the harmonic content of the grid-side current, such as Figure 8 As shown in the waveform, the voltage and current are in phase, which means that the power factor correction function is achieved.

[0063] Fig. 9 The output DC voltage U of the single-phase interleaved parallel voltage doubler rectifier dc Waveform diagram, the present invention designs a single-phase staggered parallel voltage doubler rectifier with input 220V / output 800V, Fig. 9 The waveform shows that the voltage U dc Double.

[0064] Fig.10 The output DC voltage U of the single-phase interleaved parallel voltage doubler rectifier when the load is halved dc Waveform, output DC voltage U dc The waveform is slightly adjusted at 0.4s to 0.5s and quickly returns to a stable state, indicating that the system adopts single-phase interleaved parallel voltage-doubler rectifiers, and has strong dynamic adjustment capability and good anti-disturbance performance.

[0065] The present invention discloses a single-phase voltage-doubling interleaved parallel power correction circuit, which combines the advantages of single-phase interleaved parallel technology and voltage-doubling rectifier circuit, realizes voltage doubling through interleaved parallel operation of multiple power converter units, and adopts voltage-doubling rectifier circuit. This new rectifier circuit not only has the characteristics of high efficiency, stability, flexibility, etc., but also can be designed and adjusted as needed to adapt to different input and output voltage requirements.

[0066] The present invention combines the advantages of single-phase interleaved parallel technology and voltage doubling rectifier circuit, operates through interleaved parallel connection of multiple power converter units, and adopts voltage doubling rectifier circuit to achieve voltage doubling. Compared with traditional rectifiers, this technology can effectively reduce the voltage stress of power devices, input current THD and the size of EMI filter by interleaved parallel connection of multiple power converter units, thereby improving the overall performance and reliability of the system. At the same time, the voltage doubling rectifier circuit can also be designed and adjusted as needed 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: Inductor L1, inductor L2, diodes D1~D8, switches S1~S2, capacitors C1, C2, C3, load R L ; AC power supply U g One end of is respectively connected to the anode of diode D1 and the cathode of diode D3, and the connection node thereof constitutes node a; AC power supply U g The other end is connected to the anode of diode D2 and the cathode of diode D4 respectively, and the connection node thereof constitutes node b; The cathode of the diode D1 is respectively connected to the cathode of the diode D2, one end of the inductor L1, and one end of the inductor L2, and the connection node thereof constitutes a node c; 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 load R L The other end of , its connected nodes constitute node d; The other end of the inductor L1 is respectively connected to the drain of the switch tube S1, the anode of the diode D5, and one end of the capacitor C3, and the connection node thereof constitutes a node h; The other end of the inductor L2 is connected to the drain of the switch tube S2 and the anode of the diode D6 respectively, and the connection node thereof constitutes a node g; the node g is connected to the node h; 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, respectively, and the connection nodes thereof constitute a node o; The other end of the capacitor C3 is connected to the anode of the diode D7 and the cathode of the diode D8, respectively, and the connection node thereof constitutes a node e; The cathode of diode D7 is connected to one end of capacitor C1 and load R L One end of , and its connected nodes constitute node p.

2. According to claim 1, a single-phase voltage-doubling interleaved parallel power correction circuit is characterized in that: The switch capacitor C3, the capacitor C1, the diode D7, and the diode D8 are connected to form a switch capacitor circuit, forming a voltage doubling structure.

3. A single-phase voltage-doubling interleaved parallel power correction circuit according to claim 1 or 2, characterized in that: Includes 6 working modes: Mode 1: Switch S2 is off, S1 is on, current flows through inductor L1, and then returns to AC power supply U after switching S1. g ; At this time, the AC power supply U g The inductor L1 is charged; the inductor L2 is charged to the capacitor C2 and the load R through the diode D6. L Charging; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 rises linearly from zero, and the current in inductor L2 continues to decrease; Mode 2: Switch S2 continues to be turned off, S1 continues to be turned on, the current flows through the inductor L1, and then returns to the AC power supply U after the switch S1. g ; At this time, the AC power supply U g Continue to charge the inductor L1; capacitor C2 charges capacitor C3 through diode D8; the current in the inductor L2 has dropped to 0, and the current in the inductor L1 continues to rise; Mode 3: Switches S1 and S2 are all turned off, and the inductor L1 is connected to the load R through the diode D5. L , capacitor C2 discharges; inductor L2 discharges to zero; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 begins to decrease linearly, and the current in inductor L2 continues to be 0; Mode 4: Switch S1 is turned off, S2 is turned on, the current flows through the inductor L2, and then returns to the AC power supply U after the switch S2. g ; At this time, the AC power supply U g The inductor L2 is charged; the inductor L1 is charged to the load R through the diode D5. L and capacitor C2; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 continues to decrease linearly, and the current in inductor L2 begins to increase linearly; Mode 5: Switch S1 continues to be turned off, S2 continues to be turned on, the current flows through the inductor L2, and then returns to the AC power supply U after the switch S2. g ; At this time, the AC power supply U g Continue to charge the inductor L2; capacitor C2 charges capacitor C3 through diode D8; the current in the inductor L1 drops to 0, and the current in the inductor L2 continues to rise; Mode 6: Switches S1 and S2 are all turned off, and inductor L2 supplies power to load R through diode D6. L , capacitor C2 is charged; capacitor C3 charges capacitor C1 through diode D7; the current in inductor L1 continues to be 0, and the current in inductor L2 begins to decrease linearly.

4. The single-phase voltage-doubling interleaved parallel power correction circuit according to claim 3, characterized in that: In the 6 working modes, the capacitor voltage U1=U2=1 / 2U dc .

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