Secondary side clamping type phase-shifted full-bridge converter
A phase-shifting full-bridge and converter technology, applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc., can solve the problems of long conduction time, easy damage, etc. The effect of conduction loss
Active Publication Date: 2021-07-16
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
In order to reduce the output current ripple, the output filter inductor is generally designed to be relatively large, so the output filter inductor current rises relatively slowly, so the current of the clamp diode also decreases relatively slowly. In the leading bridge arm, resonant inductor and clamp diode If the current rise of the output filter inductor is less than the resonant current, the conduction time of the diode will be as long as half a switching cycle
Moreover, the clamping diode is hard to turn off, there is a serious reverse recovery problem, and it is easy to be damaged when the input voltage is high
Method used
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[0029] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0030] refer to figure 2 and image 3 , the present invention provides a secondary side clamp type phase-shifting full bridge converter, the secondary side of the secondary side clamping type phase shifting full bridge converter has a center tap, and the center tap includes a clamping diode connected at the midpoint of the secondary side The anode of D5 and the cathode of the clamping diode D5 are connected to the positive bus bar of the output; the transformation ratio of the secondary clamping type ...
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The invention provides a secondary side clamping type phase-shifted full-bridge converter. A secondary side of the secondary side clamping type phase-shifted full-bridge converter is provided with a center tap, the center tap comprises an anode connected with a clamping diode D5 at the middle point of the secondary side, and a cathode of the clamping diode D5 is connected with an output positive bus. The number of used clamping circuit devices is only half of that of a primary side clamping type phase-shifted full-bridge converter, and the stress of the devices is greatly reduced; the proposed topology has no reverse recovery loss of a clamping diode; and the conduction loss of the clamping diode during light load is effectively reduced.
Description
technical field [0001] The present invention relates to the technical field of power electronic conversion, in particular to a secondary-side clamped phase-shifting full-bridge converter. Background technique [0002] In a full-switch full-bridge converter, the transformer leakage inductance or auxiliary inductance is used to realize the ZVS of the switching tube. When the switching mode of the converter changes, the output rectifier diode starts to commutate. At this time, the leakage inductance of the primary side or the auxiliary inductance It resonates with the junction capacitance of the output rectifier diode, causing voltage oscillation and voltage spikes in the output rectifier diode, resulting in higher voltage stress of the output rectifier diode. [0003] The traditional primary-side clamped phase-shift full-bridge topology introduces two clamping diodes on the primary side, which effectively eliminates voltage oscillation and voltage spikes caused by the output r...
Claims
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IPC IPC(8): H02M3/335
CPCH02M3/33569
Inventor 杨煜志王勇
Owner SHANGHAI JIAO TONG UNIV