Electric vehicle and its dc-dc converter and control method of dc-dc converter
A DC-DC, control method technology, applied in the direction of adjusting electrical variables, control/regulating systems, converting DC power input to DC power output, etc. Improve the working life and prolong the life cycle effect
Active Publication Date: 2020-03-31
BYD CO LTD
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Problems solved by technology
However, when the phase-shift modulation control method is adopted, the super-forearm is easy to realize soft switching, but the lagging arm is not easy to realize soft switching, so the lagging arm is more heated than the super-forearm; when the control method of down-tube modulation is adopted, the upper tube is easy to realize soft switching , and the lower tube is not easy to achieve soft switching, so the lower tube is more heated than the upper tube
[0004] Therefore, both of the above two control methods will cause serious heating problems of the switch tube and affect the working life of the switch tube.
Method used
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[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0020] The control method of the DC-DC converter proposed by the embodiment of the present invention, the DC-DC converter and the electric vehicle with the DC-DC converter are described below with reference to the accompanying drawings.
[0021] Such as figure 1 As shown, the DC-DC converter according to one embodiment of the present invention includes an H-bridge, and the H-bridge may include a first switching tube Q1 , a second switching tube Q2 , a third switching tube Q3 and a fourth switching tube Q4 . Wherein, the first sw...
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he invention discloses an electrical vehicle, a DC-DC converter and the control method of the DC-DC converter. The DC-DC converter comprises an H bridge. The H bridge comprises a first switch tube, asecond switch tube, a third switch tube and a fourth switch tube. The control method comprises the following steps of controlling the H bridge, and when the DC-DC converter works, acquiring total timeTA for controlling the H bridge by using a first mode; acquiring total time TB for controlling the H bridge by using a second mode; determining a relation between the total time TA and the total timeTB; and according to the relation between the total time TA and the total time TB, selecting the control mode of the H bridge so as to carry out temperature equalization control on the first switch tube, the second switch tube, the third switch tube and the fourth switch tube so that the heat generation of the first, second, third and fourth switch tubes in the H bridge is relative balance and the service lives of the switch tubes in the H bridge are prolonged.
Description
technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a control method of a DC-DC converter, a DC-DC converter and an electric vehicle. Background technique [0002] DC-DC converters have always been an important part of the power electronics field. With the development of commercialization of electric vehicles, DC-DC converters have also become one of the important components of electric vehicles. There are many topologies of DC-DC converters. In the field of medium and large power, the full-bridge PWM converter is the most widely used topology. [0003] Among them, there are many control methods for the full-bridge PWM converter, and most of the related technologies adopt the control method of phase-shift modulation and the control method of down-switch modulation. However, when the phase-shift modulation control method is adopted, the super-forearm is easy to realize soft switching, but the lagging arm is not easy to r...
Claims
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IPC IPC(8): H02M3/335
CPCH02M3/3353
Inventor 张妮王兴辉王超沈晓峰邬白贺
Owner BYD CO LTD