Low stress soft charge circuit for diode front end variable frequency drive
- 申请公布号：
- US2011038185(A1)
- 申请号：
- US20090655327
- 申请日期：
- 2009.12.29
- 申请公布日期：
- 2011.02.17
- 申请人：
- SWAMY MAHESH M;KUME TSUNEO JOE
- 发明人：
- SWAMY MAHESH M.;KUME TSUNEO JOE
- 分类号：
- H02J4/00;H02M7/44
- 主分类号：
- H02J4/00
- 摘要：
- A variable frequency drive comprises a diode rectifier receiving multiphase AC power from a source and converting the AC power to DC power. An inverter receives DC power and converts the DC power to AC power to drive a load. A link circuit is connected between the diode rectifier and the inverter and comprises a DC bus to provide a relatively fixed DC voltage for the inverter. A bus capacitor is across the bus. A soft charge circuit limits inrush current to the bus capacitor. The soft charge circuit comprises an inductor connected between the source and the link circuit and a switch circuit in the link circuit for selectively providing a semiconverter configuration or a full bridge converter configuration to provide two stage charging of the bus capacitor.
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