DC-DC converter topological structure

Abstract

The invention relates to the technical field of automobile power supply transformation, in particular to a DC-DC converter topological structure which comprises a primary circuit, a first transformer, a second transformer and a secondary circuit. The primary circuit comprises a DC power supply, an input capacitor, a pre-stage full-bridge circuit and a primary DC voltage-stabilizing capacitor; the pre-stage full-bridge circuit comprises a first-phase half-bridge circuit, a second-phase half-bridge circuit and a third-phase half-bridge circuit; the half-bridge circuit comprises a power switch tube connected in parallel with a backward diode; the first transformer and the second transformer are connected in parallel; the first-phase half-bridge circuit is connected with the upper side of the primary side of the first transformer; a first inductor is connected in series between the first-phase half-bridge circuit and the first transformer; the other side of the primary side DC voltage-stabilizing capacitor is connected with the primary side lower side of the first transformer and the primary side upper side of the second transformer; and a second inductor is connected in series between the third-phase half-bridge circuit and the second transformer. The loss during switching of the half-bridge circuit can be reduced; and the number of power switch tubes required in the circuit is reduced.

Description

technical field [0001] The invention relates to the technical field of voltage transformation of automobile power supplies, in particular to a topology structure of a DC-DC converter. Background technique [0002] In recent years, the problem of energy shortage has been intensified. In order to adapt to the development of new energy industry and alleviate the emission pollution of fuel vehicles, the development of electric vehicles has become a current research hotspot. The core power source of an electric vehicle is a power battery, and a series-parallel connection of single lithium batteries is generally used to meet the requirements of output voltage and output capacity. However, due to the large difference between the charge and discharge voltage range of the single lithium battery and the voltage range required for the actual operation of the car, such as low-voltage 12V devices such as audio and intelligent voice do not match the 48V output of the battery, so in actual...

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Problems solved by technology

However, due to the large difference between the charge and discharge voltage range of the single lithium battery and the voltage range required for the actual operation of the car, such as low-voltage 12V devices such as audio and intelligent voice do not match the 48V output of the battery, so in actual use , requires a DC-DC converter that adapts to a wide range of input and output

The existing DC-DC converter has achieved the technical effect of a wide input and output range, but the power loss in the circuit is high, which is not conducive to the battery life of the car power battery

Moreover, in the existing DC-DC converter circuit, when multiple transformers are used to change the voltage range, it is necessary to adapt corresponding power switch tubes to each transformer, and the required number of power switch tubes is relatively large.

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