Soft switching method of double-active full-bridge DC converter under multiple-phase-shifting control
A technology of DC converter and full-bridge converter, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., can solve the problems of long diode conduction time, difficulty, and increase of diode conduction loss, etc. , to achieve the effect of improving power transmission efficiency
Active Publication Date: 2019-12-10
艾尚储能科技(苏州)有限公司
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However, this will cause the body diode conduction time of the switching device to be too long at other operating points, thereby increasing unnecessary diode conduction losses and reducing the overall efficiency of the converter.
How to dynamically find out the optimal switching function dead time corresponding to each operating point, which can not only ensure ZVS soft switching, but also reduce the body diode conduction time of the switching device, is very difficult
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[0021] Such as figure 1 As shown, the DAB type DC converter is mainly composed of an input-side full-bridge converter, an output-side full-bridge converter, and a high-frequency transformer, and also includes an input-side power supply V 1 , output power supply V 2 .
[0022] In the multiple phase-shifting control mode, the upper and lower switches in each bridge arm of the full-bridge converter adopt a complementary switching mode, and the duty cycle is 50%. Based on the upper switch of the bridge arm A of the full-bridge converter on the input side, the switching function of the upper switch in each bridge arm is as follows: figure 2 shown. where d 1 is the ratio of the switching phase difference between bridge arm B and bridge arm A in the full-bridge converter on the input side to the switching period; s is the switching phase difference between bridge arm A of the output-side full-bridge converter and bridge arm A of the input-side full-bridge converter The proport...
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The invention discloses a soft switching method of a double-active full-bridge DC converter under multiple-phase-shifting control. The multiple-phase-shifting control refers that the size and direction of transmission power are controlled by controlling the switching phase difference between bridge arms in an input and output side full-bridge converter and the switching phase difference between two full-bridge converters. The soft switching method comprises the steps of carrying out first-order harmonic approximation on each bridge arm switching function and equivalent circuit state variable in the direct-current converter, and deriving an analytical solution of steady-state transformer current under the multiple-phase-shifting control; carrying out equivalent circuit modeling on the commutation process of the direct-current converter, substituting the steady-state transformer current, and deriving a dead time analytical solution meeting ZVS soft switching requirements. According to the invention, ZVS soft switching can be achieved only by optimizing the dead time of the switching function under the multiple-phase-shifting control under the condition that the topological structureand circuit parameters of the DAB type direct-current converter are not changed, and the power transmission efficiency of the direct-current converter is greatly improved.
Description
technical field [0001] The invention relates to the field of DC converters, and relates to a soft switching mode of a double active full-bridge DC converter under multiple phase-shift control. Background technique [0002] Dual-Active Bridge (DAB) DC converter has the advantages of electrical isolation, bidirectional power transmission and high power density, and is widely used in energy storage and other fields. Such as Figure 1 As shown, the DAB DC converter is mainly composed of an input-side full-bridge converter, an output-side full-bridge converter and a high-frequency transformer. [0003] In the traditional multiple phase-shifting control method of the DAB type DC converter, the two switching devices in each bridge arm of the full-bridge converter adopt a complementary switching mode, and the switching phase difference between the bridge arms is 180°. By controlling the switch phase difference between the full-bridge converter on the input and output sides and the ...
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IPC IPC(8): H02M3/335H02M1/38
CPCH02M1/38H02M3/33576H02M1/0058H02M1/385Y02B70/10
Inventor 肖华谢晓华颜健陆青沈嘉俊
Owner 艾尚储能科技(苏州)有限公司