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High-power bi-directional DC (Direct Current)-DC converter circuit in soft switching mode

A DC-DC and soft switching technology, applied in the field of power electronics, can solve problems such as low switching frequency, large electromagnetic noise, and large filter inductor volume, and achieve the goals of reducing switching loss, simple circuit structure, and improving the overall efficiency of the circuit Effect

Inactive Publication Date: 2016-11-09
国海峰 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low switching frequency, the matching filter inductor has a large volume
At the same time, it will generate a lot of electromagnetic noise

Method used

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  • High-power bi-directional DC (Direct Current)-DC converter circuit in soft switching mode
  • High-power bi-directional DC (Direct Current)-DC converter circuit in soft switching mode
  • High-power bi-directional DC (Direct Current)-DC converter circuit in soft switching mode

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Experimental program
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Effect test

Embodiment Construction

[0016] Such as figure 1 As shown, the high-power soft-switching bidirectional DC-DC converter circuit and its control method include an input power circuit (1), a Buck-Boost half-bridge conversion circuit (2), a resonant auxiliary network (3), and an L filter A network (4), an output power circuit (5), an isolation drive circuit (6), a zero-voltage detection circuit (7), and a current detection circuit (8).

[0017] The input power supply (1) and the output power supply circuit (5) are batteries, supercapacitor banks or other types of electric energy storage devices.

[0018] The two ends of the capacitor C2 in the resonant auxiliary network (3) are respectively connected to the collector and emitter of the switching tube VT1, and the two ends of the capacitor C3 in the resonant auxiliary network are respectively connected to the collector and emitter of the switching tube VT2.

[0019] The voltage of the zero voltage detection circuit (7) is obtained from the VT1 emitter (Ue...

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Abstract

The invention discloses a high-power bi-directional DC (Direct Current)-DC converter circuit in a soft switching mode. The circuit comprises a conventional Buck-Boost topological structure and an auxiliary resonant network which are connected; an input end of the Buck-Boost topological structure is connected with an input direct-current power supply Uin; and the auxiliary resonant network consists of two auxiliary capacitors. A middle point of a half bridge formed by a VT1 (Switch Tube 1) and a VT2 (Switch Tube 2) is connected with an output power supply Uout through a filter inductor L1. The circuit is controlled by the VT1 and the VT2 so that a current of the L1 is in a reverse intermittent operation state, zero-voltage switching-on and zero-voltage switching-off of the VT1 and the VT2 are realized, and the switching losses of the VT1 and the VT2 are reduced. Compared with the prior art, the circuit has the advantages that the bi-directional flow of power is realized in a high-voltage and high-power application occasion, the soft switching mode is employed for a power switch tube, the switching loss is reduced and the overall efficiency of the circuit is improved; and meanwhile the circuit is simple in structure and low in cost.

Description

technical field [0001] The invention relates to a high-power soft-switching mode bidirectional DC-DC converter circuit, which belongs to the technical field of power electronics. Background technique [0002] In fields such as electric vehicles, rail transit, and photovoltaic power generation, high-power non-isolated DC-DC converters are inseparable. How to select the converter circuit structure and a good control method to increase the power density of the converter and reduce electromagnetic interference is crucial to the optimization of the overall system performance and the improvement of energy utilization efficiency. [0003] In the field of rail transit energy recovery applications, energy is required to flow bidirectionally, due to its high voltage (1800V) and large current (2000A). Considering the complexity and cost of the structure, non-isolated converters are generally selected. In practical applications, due to the limitation of the characteristics of the powe...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1582H02M1/0058Y02B70/10
Inventor 国海峰孙力刘青山
Owner 国海峰
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