续流二极管

功率H桥中续流二极管特性研究

The study for characteristics of continuous current diode in power H-Bridge

在引脚VS增加一个反向的续流二极管与地相连，抑制负过冲，保证高边驱动芯片不会烧毁。

By adding a reverse diode connected to ground , the chip will not burn any more .

在研究了IGBT开关损耗与续流二极管的互相关系后，本文指出IGBT开关损耗与续流二极管开关特性存在互相制约，无法通过加快换流速度来降低开关损耗。

After studying the relationship between IGBT switching loss and the freewheeling diode switching characteristics , it points out that both devices have restriction mutually , and can not reduce switching loss by quickening up switching speed .

本文首先介绍了悬浮斩波器的各基本组成部分的相关特性：包括续流二极管的特性、IGBT的特性、IGBT的驱动和保护以及悬浮斩波器的负载特性。

Firstly , this paper introduces the characters of basic components of maglev chopper which including the character of freewheeling diode , the character of IGBT , the drive and protection of IGBT and the character of load .

高压功率快恢复二极管（以下简称FRD）广泛地应用于电力电子电路中，作为续流二极管与三端功率器件并联使用，是现代电力电子技术中的关键器件。

Power fast recovery diode , which is abbreviated to FRD , is one of the key devices in modern power electronic technology . In the power electronic circuits , FRD is usually parallel connected with three-end power devices as their freewheeling diode .

使用半波整流电源必需加装续流二极管。

Use half wave rectifying power supply must add free-wheeling diode .

另外，续流二极管的反向恢复特性也有明显改善。

The reverse recovery properties of the freewheel diode are also distinctly improved .

此外，续流二极管的反向恢复损耗被降低到最小，辅助开关也实现了零电流开关。

Furthermore , reverse recovery losses of main diodes are minimized , and auxiliary switches commutate at zero current .

针对传统的续流二极管检测方法存在的不足，本文提出了一种简化的续流二极管检测方法。

A method for simplified free-wheeling diode is proposed in this paper , which is based on the method for traditional free-wheeling diode .

分析了单相半控桥整流电路的失控现象及产生原因，说明了续流二极管的作用，提出了根据单结晶体管触发电路特点和晶闸管特性采取的应对措施。

This paper analyzes the runaway phenomenon and its causes of the single-phase half-controlled-bridge commutated circuit , describes the functions of the fly-wheel diode , and puts forward some corresponding measures according to the features of the trigger circuit of double-base diode and the peculiarities of thyristor .

此外，对驱动电路的关键元器件进行了详细的分析设计，如电感、续流二极管、功率开关管等，科学合理的元器件参数设计很好的保证了整体驱动电路的高效稳定性。

In addition , detailed analysis and design have been applied to the key components of the driver circuit such as inductance , the fly-wheel diode , power switch tube and so on . Scientific and rational components parameter design guaranteed the overall efficient stability of the drive circuit .

通过仿真分析得知，在续流过程中IGBT能够理想关断轨迹的条件是续流二极管不开通。

Simulation results show that , the after-flow diode keeps closed is the condition of ideal IGBT turn-off track during after-flow .