A control method for a bidirectional bridge-type modular switched capacitor ac-ac converter

Abstract

The present invention proposes a bidirectional bridge-type modular switched capacitor AC-AC converter control method, based on a bidirectional bridge-type modular switched capacitor topology, by adjusting the phase-shifting time between the switch tubes and optimizing the logic sequence between the switch tubes The improved phase-shift control strategy for the switching tube solves the inherent defects that the existing switched capacitor AC-AC converter can only achieve fixed ratio voltage regulation and the voltage regulation range is not flexible; at the same time, this control strategy solves the problem of The safety commutation problem brought about by the introduction of the resonant inductance circuit; in addition, without changing the bidirectional bridge modular switched capacitor topology, only changing the input and output ports of the converter can switch its up / down working state, realizing bidirectional operate.

Description

technical field

[0001] The invention relates to the technical field of AC-AC conversion, in particular to a control method for a bidirectional bridge-type modular switched capacitor AC-AC converter. Background technique

[0002] Switched capacitor converter is a new type of converter without magnetic components. With its advantages of low cost, small size, high integration, high efficiency and high power density, it is widely used in new energy power generation, micro grid, electric vehicles and other fields. application is becoming more and more widespread. After more than 20 years of development, the switched capacitor converter has made a series of improvements in topology and control methods compared with the first proposed switched capacitor converter, whether it is conversion efficiency or operating power. It has been greatly improved, but most of the existing switched capacitor converters have the disadvantage of weak output voltage ratio adjustment capability. To re...

Examples

Embodiment 1

[0042] This example takes step-down mode as an example: figure 1 As shown, the topology consists of a power supply V H , Basic switched capacitor module, quasi-H bridge, resonant inductor L r , Energy storage capacitor C 1 and load R. The topology shares 16 fully-controlled device MOSFETs, which are numbered as p and n groups respectively. The fully controlled device MOSFET numbered p is S 1p , S 2p , S 3p , S 4p , S 5p , S 6p , S 7p and S 8p , the full-control device MOSFET numbered n is S 1n , S 2n , S 3n , S 4n , S 5n , S 6n , S 7n and S 8n .

[0043] Specifically, such as Figure 4 As shown, the quasi-H-bridge has six input / output terminals, which are named 3, 4, 9, 10, 11, and 12 respectively. The quasi-H bridge includes 8 MOSFET switch tubes S 1p , S 2p , S 3p , S 4p , S 1n , S 2n , S 3n and S 4n , the S 1p and S 1n The common source is connected in series to form the first bidirectional switch, S 2p and S 2n The common source is connecte...

Embodiment 2

[0077] This example takes the boost mode as an example. When the circuit works in the boost mode, the circuit topology remains unchanged, and only the input and output ports need to be exchanged. Such as figure 2 As shown, the topology consists of a power supply V L , Basic switched capacitor module, quasi-H bridge, resonant inductor L r , Energy storage capacitor C 1 and load R. The topology shares 16 fully-controlled device MOSFETs, which are numbered as p and n groups respectively. The fully-controlled device MOSFET numbered in group p is S 1p , S 2p , S 3p , S 4p , S 5p , S 6p , S 7p and S 8p , the full-control device MOSFET numbered n is S 1n , S 2n , S 3n , S 4n , S 5n , S 6n , S 7n and S 8n .

[0078] Specifically, such as Figure 4 As shown, the quasi-H-bridge has six input / output terminals, which are named 3, 4, 9, 10, 11, and 12 respectively. The quasi-H bridge includes 8 MOSFET switch tubes S 1p , S 2p , S 3p , S 4p , S 1n , S 2n , S 3n...

technical field

[0001] The invention relates to the technical field of AC-AC conversion, in particular to a control method for a bidirectional bridge-type modular switched capacitor AC-AC converter. Background technique

[0002] Switched capacitor converter is a new type of converter without magnetic components. With its advantages of low cost, small size, high integration, high efficiency and high power density, it is widely used in new energy power generation, micro grid, electric vehicles and other fields. application is becoming more and more widespread. After more than 20 years of development, the switched capacitor converter has made a series of improvements in topology and control methods compared with the first proposed switched capacitor converter, whether it is conversion efficiency or operating power. It has been greatly improved, but most of the existing switched capacitor converters have the disadvantage of weak output voltage ratio adjustment capability. To re...

Examples

Embodiment 1

[0042] This example takes step-down mode as an example: figure 1 As shown, the topology consists of a power supply V H , Basic switched capacitor module, quasi-H bridge, resonant inductor L r , Energy storage capacitor C 1 and load R. The topology shares 16 fully-controlled device MOSFETs, which are numbered as p and n groups respectively. The fully controlled device MOSFET numbered p is S 1p , S 2p , S 3p , S 4p , S 5p , S 6p , S 7p and S 8p , the full-control device MOSFET numbered n is S 1n , S 2n , S 3n , S 4n , S 5n , S 6n , S 7n and S 8n .

[0043] Specifically, such as Figure 4 As shown, the quasi-H-bridge has six input / output terminals, which are named 3, 4, 9, 10, 11, and 12 respectively. The quasi-H bridge includes 8 MOSFET switch tubes S 1p , S 2p , S 3p , S 4p , S 1n , S 2n , S 3n and S 4n , the S 1p and S 1n The common source is connected in series to form the first bidirectional switch, S 2p and S 2n The common source is connecte...

Embodiment 2

[0077] This example takes the boost mode as an example. When the circuit works in the boost mode, the circuit topology remains unchanged, and only the input and output ports need to be exchanged. Such as figure 2 As shown, the topology consists of a power supply V L , Basic switched capacitor module, quasi-H bridge, resonant inductor L r , Energy storage capacitor C 1 and load R. The topology shares 16 fully-controlled device MOSFETs, which are numbered as p and n groups respectively. The fully-controlled device MOSFET numbered in group p is S 1p , S 2p , S 3p , S 4p , S 5p , S 6p , S 7p and S 8p , the full-control device MOSFET numbered n is S 1n , S 2n , S 3n , S 4n , S 5n , S 6n , S 7n and S 8n .

[0078] Specifically, such as Figure 4 As shown, the quasi-H-bridge has six input / output terminals, which are named 3, 4, 9, 10, 11, and 12 respectively. The quasi-H bridge includes 8 MOSFET switch tubes S 1p , S 2p , S 3p , S 4p , S 1n , S 2n , S 3n...

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