DC-DC converting device for electric automobiles
A DC-DC, conversion device technology, applied in the output power conversion device, regulation of electrical variables, conversion of DC power input to DC power output, etc., can solve the problems of increased cost of diodes, reverse charging of batteries, and influence of control circuits. , to achieve the effect of saving cost and space, reducing use and improving conversion efficiency
Active Publication Date: 2014-10-22
BYD CO LTD
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Problems solved by technology
[0004] In order to solve the problem that the output voltage of the DC-DC converter on the electric vehicle is lower than the voltage of the battery when it starts to work, causing the battery to be reversely charged, the existing technology is to perform full-bridge rectification when the DC-DC converter starts to work until When the output voltage of the DC-DC converter is greater than 12VDC, perform synchronous rectification
In order to realize the conversion from full-bridge rectification to synchronous rectification when the output voltage reaches 12VDC, it is necessary to add a low-voltage sampling circuit and a conversion control circuit, the circuit structure becomes complicated, and the added diode will also increase the cost
Also, the control circuit will be affected by interference signals
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[0014] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are only used to explain the present invention, and cannot be construed as limiting the present invention.
[0015] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and are not intended to limit the invention. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification an...
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The invention provides a DC-DC converting device for electric automobiles. The DC-DC converting device comprises an inverter module, a resonance module, a transformer, a synchronous rectification module, and a controller. The inverter module is connected with a high-voltage battery pack and is used for converting DC inputted by the high-voltage battery pack into AC. The resonance module is connected with the output end of the inverter module. The input end of the transformer is connected with the resonance module. The synchronous rectification module is connected with the output end of the transformer and is used for converting AC transformed by the transformer into DC. The controller is connected with the inverter module and the synchronous rectification module and is used for outputting a PWM signal to control the inverter module, controlling the phase shift of the PWM signal so as to set the duty ratio of the transformer, and controlling the synchronous rectification module to perform synchronous rectification. The output of the DC-DC converting device may instantly rise to certain voltage when the DC-DC converting device begins to operate such that the influence of negative current is solved and relieved. Further, the DC-DC converting device is simple in circuit structure and high in conversion efficiency.
Description
Technical field [0001] The present invention relates to the technical field of power electronics, in particular to a DC-DC converter for electric vehicles. Background technique [0002] The current rectification circuit is mainly divided into full bridge rectification and synchronous rectification. Among them, full-bridge rectification mainly uses the unidirectional conductivity of diodes for rectification, but the efficiency is low. In order to improve the efficiency of DC-DC converters, synchronous rectification has become the current main rectification method. According to statistics, synchronous rectification can increase the efficiency by 5 percentage points. However, synchronous rectification also brings many problems. The main problem is that the DC-DC converter will have a large negative current at the moment of startup (the negative current caused by different rectifier MOS tubes is not consistent, but they are all in the hundreds of amperes. about). [0003] At presen...
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IPC IPC(8): H02M3/335
Inventor 汤小华梁树林胡前海
Owner BYD CO LTD