Electric vehicle and its dc-dc converter and control method of dc-dc converter
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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 working life, heat balance, prolong life cycle effect
Active Publication Date: 2020-03-31
BYD CO LTD
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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.
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[0021] 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.
[0022] 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.
[0023] Such as figure 1As 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 swi...
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Abstract
The invention discloses an electric vehicle, a DC-DC converter thereof and a control method of the DC-DC converter, wherein the DC-DC converter comprises an H bridge, and the H bridge comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube. The control method includes the following steps of obtaining total times TA, TB, TC, and TD for controlling the H bridge in the first mode, the second mode, the third mode, and the fourth mode while the DC-DC converter is operating, and obtaining set times Tx, Ty, Ti and Tm of the H bridge controlled in the first mode, the second mode, the third mode, and the fourth mode in each working cycle of the operation of the DC-DC converter; and determining the relationship among the total times TA, TB, TC and TD to select the way to control the H bridge when the DC-DC converter is started, and alternately controlling the H bridge according to the set times Tx, Ty and Ti and Tm to perform temperature equalization control on the first switch tube to the fourth switch tube, so that the heating of the first switch tube to the fourth switch tube in the H bridge is relatively balanced, improving the working life of the switch tubes in the H bridge.
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...
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