Electric vehicle and its dc-dc converter and control method of dc-dc converter
A technology of DC-DC and control methods, which is applied in the direction of adjusting electric variables, control/regulation systems, and converting DC power input to DC power output, etc. It can solve the problems of lagging arm heating, difficult soft switching, and switching tube heating, etc., to achieve Improve working life, prolong life cycle, heat balance effect
Active Publication Date: 2019-11-08
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.
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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 1 As shown, the DC-DC converter according to an embodiment of the present invention includes an H-bridge, and the H-bridge includes a first switching tube Q1 , a second switching tube Q2 , a third switching tube Q3 and a fourth switching tube Q4 . Wherein, the first switchi...
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The invention discloses an electric automobile, a DC-DC converter and a control method of the DC-DC converter. The DC-DC converter comprises an H-bridge, wherein the H-bridge comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube. The control method comprises the steps that a control mode of phase shift modulation and a control mode of lower tube modulation are alternately adopted within the whole life cycle of the DC-DC converter, a first mode or a second mode is selected to control the H-bridge based on the total time TA and the total time TB when the control mode of phase shift modulation is adopted, and the H-bridge is controlled to alternately operate in a third mode or a third mode based on set time Tm and set time Ti when the control module of lower tube modulation is adopted so as to carry out temperature equalization control on the first switching tube, the second switching tube, the third switching tube and the fourth switching tube, thereby being capable of enabling the first switching tube, the second switching tube, the third switching tube and the fourth switching tube in the H-bridge to be relatively balanced inheat generation, and prolonging the operating life of the switching 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...
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