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Original edge clamp circuit of DC converter

A technology of DC converter and clamping circuit, which is applied in the direction of converting DC power input to DC power output, intermediate conversion to AC conversion equipment, conversion of AC power input to DC power output, etc., which can solve the problem of switch tube damage and transformer T1 bias magnetic saturation and other issues

Active Publication Date: 2011-07-13
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a primary side clamping circuit of a DC converter, to solve the problem that the clamping circuit topology in the prior art described above will provide a discharge channel for the DC blocking capacitor Cb under certain working conditions, causing the transformer T1 bias magnetic saturation, and then lead to the problem of damage to the switch tube

Method used

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  • Original edge clamp circuit of DC converter
  • Original edge clamp circuit of DC converter
  • Original edge clamp circuit of DC converter

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Embodiment 1

[0045] Embodiment 1 (first form):

[0046] After analysis, we found that as long as the figure 1, figure 2 and image 3 Clamp circuit topologies in (such as Figure 4 ) to make some improvements, that is, add a capacitor C1 between the clamped point between the resonant inductance Lr and the transformer T1 to the connecting line of the diode D7 and D8 (such as Figure 5 shown). The selection of capacitor C1 parameters will have a certain impact on the performance of the circuit. When the capacitance of C1 is too large, the DC blocking capacitor Cb can still form a discharge channel through C1; when the value of capacitor C1 is too small, it will directly affect the clamping circuit. Clamping effect on the voltage across the transformer and the secondary diode. The value of capacitor C1 generally needs to meet Cb / 25 Figure 4 and Figure 5 Among them, for a full bridge circuit, V1 and V2 are respectively connected to the midpoints of Q1 and Q2 and the midpoints of Q3 and ...

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Abstract

The utility model provides a primary side clamping circuit of a direct current converter. An anti-leakage capacitance is arranged between connections of the clamped point which is in the middle of a resonant inductance and a transformer, and the clamping diode, so as to cut off the release or bypass channel from a blocking capacitance through the clamping diode. Therefore, the transformer can be effectively prevented from working in magnetic biasing state under the conditions that the clamping performance is basically constant when the voltages of the positive and negative bus-bars are balanced, the voltages of the positive and negative input bus-bars are different, or driving pulses widths of positive and negative half-cycle from the switching tube are inconsistent, so that the reliability of the whole circuit is promoted, the current stress of the clamping diode is reduced. The clamping performances of two terminal voltages of the transformer and the both terminal voltages of the transformer secondary side rectifier diode are improved.

Description

technical field [0001] The invention relates to a primary side clamping circuit of a DC converter. Background technique [0002] The topology of the three-level DC / DC clamp circuit that has been published is as follows: figure 1 and figure 2 shown. VC+ and VC- are positive and negative DC voltage sources respectively, Q1~Q4 are switching tubes, D1~D4 are anti-parallel diodes, D7~D8 are clamping diodes, D9~D10 are freewheeling diodes, D5~D6 are output rectifier diodes , Cb is a DC blocking capacitor, Lr is a resonant inductor, T1 is a transformer, Lf is an output inductor, Cf is an output capacitor, and R1 is a load. in figure 1 Connect D7 and D8 between Lr and T1 to form a clamping circuit, and clamp the voltage at both ends of transformer T1 to VC+ and VC-; figure 2 The clamp circuit is composed of D1, D7, D8, D4, Lr and T1. [0003] Since the three-level DC / DC input is composed of positive and negative DC voltage sources VC+ and VC-, in practical applications, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335H02M7/5387
Inventor 柏建国刘小园茹永刚黄伯宁
Owner VERTIV CORP