Topological structure of bidirectional L type DC-DC converter
A technology of DC-DC and topological structure, applied in the direction of conversion equipment without intermediate conversion to AC, conversion of DC power input to DC power output, instruments, etc., can solve the problem of insufficient stability, difficulty in ensuring control accuracy, and system reliability Low-level problems, to achieve the effect of overcoming the lack of stability and reliability, equal device withstand voltage, and high control accuracy
Inactive Publication Date: 2010-09-15
BEIJING JIAOTONG UNIV
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Problems solved by technology
Due to the high boost multiple, it is difficult to guarantee the control accuracy. At the same time, the series structure of the system leads to low system reliability and insufficient stability.
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[0012] The present invention will be further described in conjunction with accompanying drawing:
[0013] figure 1 The topology diagram for the improved L-type boost converter. Through k switching devices, the controllable switch S 11 , S 21 ... S k1 The horizontal axis of the L-type converter is formed in series; through k capacitors C 1 、C 2 ...C k The vertical axis of the L-shaped converter is formed in series; the switch S on the horizontal axis i1 , S (i-1)1 The node between and the capacitance C on the vertical axis (i-1) 、C i The nodes between have one-way controllable switches flowing from the vertical axis to the horizontal axis, where i=2...k; through k-1 switching devices, the controllable switch S 14 , S 24 ... S (k-1)4 The horizontal axis extension axis of the L-shaped converter is formed in series; the switch S on the horizontal axis i1 , S (i-1)1 The node between the horizontal axis and the extension axis switch S i4 , S (i-1)4 There is a one-way...
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The invention discloses a topological structure of a bidirectional L-shaped DC-DC convertor. In the structure, k parts of controllable switches, S11, S21, to Sk1, are connected in series to form the cross axis of the L-shaped convertor; k capacitances C1, C2, to Ck are connected in series to form the longitudinal axis of the convertor; the nodes between the switches Si1 and S(i minus 1)1 on the cross axis and the nodes between the capacitances C(i minus 1) and Ci on the longitudinal axis are provided with a uni-directional controllable switch flowing from the longitudinal axis to the cross axis, wherein, i equals to 2 to k; through k minus 1 switch parts, the controllable switches S14, S24, to S(k minus 1)4 are connected in series to form the spindle extension of the cross axis of the L-shaped convertor; a uni-directional controllable switch Si3 is arranged between the node of the switches Si1 and S(Ii minus 1)1 on the cross axis and the node of the switches Si4 and S(i minus 1)4 on the spindle extension, wherein, i equals to 2 to k; the S11 on the cross axis and the C1 longitudinal axis intersect to form the intersection point between the cross axis and the longitudinal axis; theSk1 on the cross axis is connected with the power supply or equivalent load V1 by the inductance; the other end of the power supply or the equivalent load V1 is connected with the S(k minus 1)4 on the spindle extension of the cross axis, k is a positive integer more than or equal to 2; the series of the convertor are expanded by the expansion of the cross and longitudinal axes of the bidirectional L-shaped structure and the uni-directional controllable switch branch.
Description
technical field [0001] The invention relates to a circuit topology structure of a power electronic bidirectional DC-DC converter, in particular to a bidirectional L-type DC-DC converter, which can realize the function of stepping up or stepping down. Background technique [0002] With the development of technology, in the traditional DC-DC step-up circuit, when the step-up / step-down ratio is high, a converter with a transformer structure or a multi-stage step-up / step-down structure is often used. Due to the high boost multiple, the control accuracy is difficult to be guaranteed, and the series structure of the system leads to low reliability and insufficient stability of the system. Contents of the invention [0003] The technical problem to be solved by the present invention is: to solve the control accuracy when the step-up / step-down multiple of the DC-DC converter is high, a method of using multiple output capacitors in series, and stepping up / down each output cascaded ...
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IPC IPC(8): H02M3/10H02M3/155
Inventor 郑琼林贺明智杨中平孙湖郝瑞祥张立伟游小杰林飞黄先进王琛琛
Owner BEIJING JIAOTONG UNIV