Isolated three-level direct-current converter
A converter, flat technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, high-efficiency power electronic conversion, etc. problems, to achieve the effect of facilitating the design of auxiliary circuit parameters and improving efficiency
Inactive Publication Date: 2020-12-08
HARBIN ENG UNIV
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Problems solved by technology
The commutation auxiliary circuit has the following two problems: 1. The auxiliary current changes with the duty cycle, which brings difficulties to the converter design, and even cannot realize soft switching in the full load range; 2. When the converter realizes natural ZVS soft switching, Unable to stop the auxiliary commutation circuit, resulting in a drop in efficiency
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[0026] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0027] The present invention realizes the ZVS soft switching in the full load range of the four-switch tube isolation three-level DC / DC converter to improve the efficiency of the converter, and proposes the topology of the active commutation auxiliary circuit, and the auxiliary current of the commutation auxiliary circuit does not vary with the duty cycle The change is convenient for the parameter design of the auxiliary circuit and the realization of ZVS soft switching in the full load range, and when the converter realizes the natural ZVS soft switching, the operation of the auxiliary commutation circuit is stopped to improve the efficiency.
[0028] The topology of the wide-range ZVS four-switch isolation three-level DC / DC converter based on the active commutation auxiliary circuit proposed by the present invention is as follows: image 3...
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The invention discloses an isolated three-level direct-current converter. A collector of a first switch tube and an emitter of a second switch tube are respectively connected with two ends of a firstinput capacitor, a collector of a third switch tube and an emitter of a fourth switch tube are respectively connected with two ends of a second input capacitor, and a pole of the second switch tube and the third switch tube are connected with a primary side winding of a transformer in parallel. A blocking capacitor is connected between the primary side winding of the transformer and the third switch tube, the blocking capacitor comprises two identical active commutation auxiliary circuits, and each of the active commutation auxiliary circuits comprises an auxiliary inductor, a capacitor and aswitch tube, one end of each auxiliary inductor is connected with one end of the capacitor, and the other end of each capacitor is connected with a collector of the switch tube. The other ends of thetwo auxiliary inductors are respectively connected with a second switch tube collector and a fourth switch tube collector; and the emitters of the two switch tubes are respectively connected with theemitter of the second switch tube and the emitter of the fourth switch tube. The auxiliary current does not change along with the duty ratio, parameter design is facilitated, and the full-load-range ZVS soft switching can be achieved.
Description
technical field [0001] The invention relates to an isolated three-level DC converter, in particular to a four-switch tube isolated three-level ZVS soft-switching DC converter with an active commutation auxiliary circuit, belonging to the technical field of DC converter soft switching. Background technique [0002] In order to increase the switching frequency of the isolated three-level converter, reduce the size of the converter and improve the efficiency of the converter, zero voltage switching (Zero Voltage Switching, ZVS) soft switching technology has been widely studied and applied. In the isolated three-level converter, the natural ZVS soft switching can be realized when the load is large, and the natural ZVS soft switching range can be increased by increasing the transformer leakage inductance. However, the natural ZVS soft switching range is small, and the increase of transformer leakage inductance will cause a large duty cycle loss, large circulating current and outp...
Claims
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IPC IPC(8): H02M3/335
CPCH02M3/33569H02M1/0058Y02B70/10
Inventor 凡绍桂游江张敬南孟繁荣巩冰
Owner HARBIN ENG UNIV