半桥和全桥变换器拓扑-------外文翻译.doc
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半桥和全桥变换器拓扑-------外文翻译,chapter 3half- and full-bridgeconverter topologies3.1 introductionhalf-bridge and full-bridge topologies stress their transistors to a voltage equal to the dc i...
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CHAPTER 3
Half- and Full-Bridge
Converter Topologies
3.1 Introduction
Half-bridge and full-bridge topologies stress their transistors to a voltage equal to the DC input voltage not to twice this value, as do the push-pull, single-ended, and interleaved forward converter to pologies. Thus the bridge topologies are used mainly in offline converters where supply voltage would be more than the switching transistors could safely tolerate. Bridge topologies are almost always used where the normal AC input voltage is 220 V or higher, and frequently even for 120-V AC inputs.
An additional valuable feature of the bridge topologies is that primary leakage inductance spikes (Figures 2.1 and 2.10) are easily clamped to the DC supply bus and the energy stored in the leakage inductance is returned to the input instead of having to be dissipated in a resistive snub -ber element.
3.1 概述
半桥和全桥拓扑开关管的稳态关断电压等于直流输入电压，而不像推挽、单端正激或交错正激拓扑那样为电压的两倍。所以桥式拓扑广泛用于直接电网的离线式变换器。而对推挽等拓扑来说，两倍的电网整流电压将超过其开关管的安全耐压容限。为此，输入网压为220V或更高的场合几乎都使用桥式拓扑。当输入网压为120V时也有使用桥式拓扑的情况。
桥式拓扑的另一优点是，能将变压器初级侧的漏感尖峰电压（如图2.1和图2.10所示）箝位于直流母线电压，并将漏感储存的能量归还到输入母线，而不是消耗于电阻元件。
Half- and Full-Bridge
Converter Topologies
3.1 Introduction
Half-bridge and full-bridge topologies stress their transistors to a voltage equal to the DC input voltage not to twice this value, as do the push-pull, single-ended, and interleaved forward converter to pologies. Thus the bridge topologies are used mainly in offline converters where supply voltage would be more than the switching transistors could safely tolerate. Bridge topologies are almost always used where the normal AC input voltage is 220 V or higher, and frequently even for 120-V AC inputs.
An additional valuable feature of the bridge topologies is that primary leakage inductance spikes (Figures 2.1 and 2.10) are easily clamped to the DC supply bus and the energy stored in the leakage inductance is returned to the input instead of having to be dissipated in a resistive snub -ber element.
3.1 概述
半桥和全桥拓扑开关管的稳态关断电压等于直流输入电压，而不像推挽、单端正激或交错正激拓扑那样为电压的两倍。所以桥式拓扑广泛用于直接电网的离线式变换器。而对推挽等拓扑来说，两倍的电网整流电压将超过其开关管的安全耐压容限。为此，输入网压为220V或更高的场合几乎都使用桥式拓扑。当输入网压为120V时也有使用桥式拓扑的情况。
桥式拓扑的另一优点是，能将变压器初级侧的漏感尖峰电压（如图2.1和图2.10所示）箝位于直流母线电压，并将漏感储存的能量归还到输入母线，而不是消耗于电阻元件。
