Isolation three-port DC-DC converter

A DC-DC, three-port technology, applied in the field of isolated three-port DC-DC converters, can solve problems such as low circuit efficiency, achieve good grid stability, improve circuit conversion efficiency, and reduce power loss.

Inactive Publication Date: 2019-04-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Generally speaking, the topology of a typical electric vehicle on-board charger with unidirectional power flow is that the DC bus charges the high-voltage battery through the first-stage DC-DC converter, and the high-voltage battery charges the high-voltage battery through the second-stage step-down DC-DC converter. For low-voltage battery charging, if both DC-DC converters adopt full-bridge structure and full-wave rectifier bridge structure, a total of 8 controllable power switches, 8 rectifier diodes and 2 transformers will be used, and the circuit efficiency is low

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Embodiment Construction

[0066] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

[0067] This embodiment provides a structural diagram of an isolated three-port DC-DC converter as shown in figure 1 As shown, it specifically includes a three-winding transformer T, a DC blocking capacitor C b , two full-bridge circuits, a full-wave rectifier circuit, two LC resonant cavities, and the two LC resonant cavities are respectively composed of the first resonant inductance L r1 , the first resonant capacitor C r1 and the second resonant inductance L r2 , the second resonant capacitor C r2 Composition; the DC bus side winding passes through the DC blocking ...

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Abstract

The invention discloses an isolation three-port DC-DC converter. The isolation three-port DC-DC converter comprises a three-winding transformer, a DC-isolation capacitor, two full-bridge circuits, a full-wave rectification circuit and two LC resonant cavities, wherein the two LC resonant cavities respectively comprises a first resonant inductor, a first resonant capacitor, a second resonant inductor and a second resonant capacitor, a DC bus-side winding is connected with a DC bus port by the DC-isolation capacitor and a first full-bridge circuit, a high-voltage battery-side winding is connected with a high-voltage battery port by the first resonant inductor, the first resonant capacitor and a second full-bridge circuit, and a low-voltage battery-side winding is connected with a low-voltagebattery port by the second resonant inductor, the second resonant capacitor and the full-wave rectification circuit. The isolation three-port DC-DC converter employs a three-winding structure, the numbers of rectification diodes and transformers are reduced, the power loss is reduced, and the circuit conversion efficiency is improved.

Description

technical field [0001] The invention belongs to the field of on-board chargers for electric vehicles, in particular to an isolated three-port DC-DC converter. Background technique [0002] Electric vehicles have attracted a lot of attention because the use of electric vehicle chargers reduces fuel usage and greenhouse gas emissions. Electric vehicle chargers are divided into two types: on-board chargers and off-board chargers, and support one-way or two-way power flow. The off-board charger can be designed as a high-power fast charging system because it is not limited by size and weight. The input of the off-board charger is 380V AC, and the output is a certain range of DC. The charging power ranges from tens of kilowatts to hundreds of kilowatts, and the charging time is 10 minutes. The DC fast charging system of off-board chargers has a large impact on the power grid, which will cause voltage fluctuations in the public power grid and generate harmonic hazards. The requi...

Claims

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Application Information

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IPC IPC(8): H02M3/335B60L55/00B60L53/22
CPCH02M3/3353H02M3/33561Y02T10/70Y02T10/7072Y02T10/72Y02T90/14
Inventor 邓焰张盈曦李广地夏晋
Owner ZHEJIANG UNIV
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