Multi-stage locomotive auxiliary converter main circuit and its ground detection circuit and detection method

Abstract

The application discloses a kind of multistage locomotive auxiliary converter main circuit and its ground detection circuit and detection method, it is related to auxiliary converter ground detection field.Specifically: traction DC bus input DC enters front stage auxiliary inverter, carries out DC-AC conversion, then passes through isolation voltage reduction and forms low-voltage alternating current, into auxiliary three-phase intermediate rectifier again to form DC, again through DC filter circuit C2, form auxiliary post-stage intermediate DC voltage, for post-stage auxiliary inverter to use, produce different three-phase alternating current, according to the different auxiliary converter load of whole vehicle, different three-phase alternating current match connection different voltage level and type auxiliary converter load of whole vehicle, each post-stage auxiliary inverter is input by auxiliary post-stage intermediate DC voltage.Ground detection circuit includes ground resistance R1 and voltage sensor TV1.The application reduces the device of ground detection circuit, reduces the volume cost of ground detection misoperation and system, improves auxiliary conversion system reliability.

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