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Direct current charger based on single-phase II-type three-level pseudo totem pole

A DC charging and totem pole technology, which is applied in the direction of efficient vehicle charging, electric vehicle charging technology, charging stations, etc., can solve the problems of high cost and achieve the effect of high withstand voltage, high reliability, and small conduction loss

Active Publication Date: 2021-08-03
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, compared with the traditional bridgeless power factor correction circuit, the pseudo-totem pole two-level power factor correction circuit has the advantages of high efficiency and no bridge arm direct connection. High, while limiting the application of two-level DC chargers in medium and high-voltage power DC charging equipment scenarios

Method used

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  • Direct current charger based on single-phase II-type three-level pseudo totem pole
  • Direct current charger based on single-phase II-type three-level pseudo totem pole
  • Direct current charger based on single-phase II-type three-level pseudo totem pole

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Embodiment Construction

[0044] Such as figure 1 As shown, a DC charger based on a single-phase Type II three-level pseudo-totem pole, the DC charger includes a pair of pseudo-totem pole bridge arms, a filter circuit, a single-phase Type II rectifier bridge, and Type II two switch tubes connected in series Type two-way switch branch, DC side up and down split capacitor.

[0045] A pair of pseudo-totem pole bridge arm structure includes two fully controlled power switch tubes S 1 , S 2 , 2 ordinary diodes D 3 、D 4 , by the fully controlled power switch S 1 , S 2 and diode D 3 、D 4 A pair of asymmetric rectification bridge arms is formed, and each bridge arm includes a power switching device and a clamping diode. S 1 Drain, inductance L 1 , Diode D 3 Anode connected to node B 1 , S 2 Source, inductance L 2 , Diode D 4 Cathode connected to node B 2 .

[0046] The filter circuit consists of a filter inductor L 1 , L 2 composition, the filter inductance L 1 , L 2 exactly the same, the ...

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Abstract

The invention discloses a direct current charger based on a single-phase II type three-level pseudo totem pole. The direct current charger comprises a pseudo totem pole bridge arm, a filter circuit and a single-phase II type rectifier bridge; the pseudo totem pole bridge arm comprises switch tubes S1 and S2 and diodes D3 and D4; the filter circuit comprises filter inductors L1 and L2; the single-phase II-type rectifier bridge comprises diodes D1 and D2, a pair of bidirectional switching tubes, capacitors C1 and C2 and a load RL; and the pair of bidirectional switch tubes comprises switch tubes S3-S6. According to the direct current charger based on the single-phase II type three-level pseudo totem pole, the pseudo totem pole rectification technology and the three-level topology technology are fused, and compared with a traditional boost power factor correction type two-level direct current charger, the stress of a switch tube can be effectively reduced, the conduction loss of the switch tube is small, and the bridge arm direct connection phenomenon does not exist; meanwhile, due to the fact that an II-type two-switch-tube series-connection type bidirectional switch branch exists in the circuit, the reliability of the direct-current charging circuit is greatly improved.

Description

technical field [0001] The invention relates to the technical field of electric energy conversion of power electronics, in particular to a DC charger based on a single-phase II-type three-level pseudo-totem pole. Background technique [0002] Electric vehicles such as electric vehicles have the advantages of high energy utilization rate, clean and pollution-free, but the development of charging equipment for charging them is slow. At the same time, AC and DC charging forms and chargers of different power levels bring different charging speeds during the charging process. Slow security issues. In addition, if the power factor of charging equipment is too low, it will increase the load on the grid or cause a waste of grid capacity. The International Electrotechnical Commission has made strict restrictions on the harmonic components contained in the charging power supply current of various types of AC to DC. Among them, compared with the traditional bridgeless power factor co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/06H02M7/217H02M7/219H02M7/25H02M7/04H02J7/02B60L53/00
CPCH02M7/066H02M7/217H02M7/219H02M7/25H02M7/04H02J7/02B60L53/00H02J2207/20B60L2210/30Y02T10/92
Inventor 马辉徐甜川敬成代红
Owner CHINA THREE GORGES UNIV
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