Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2007-07-31
2007-07-31
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C318S800000, C318S801000, C318S132000, C318S254100, C318S434000, C361S093700, C361S093800, C361S093900, C361S106000
Reexamination Certificate
active
10924252
ABSTRACT:
A voltage source converter with a line-side diode rectifier, a load-side inverter with an electronic circuit, a power supply for the electronic circuit, and a slim DC link with a DC link capacitor is described. The slim DC link connects a DC output side of the line-side diode rectifier with a DC input side of the load-side inverter. A buffer capacitor is connected across the power supply, and a decoupling diode and a current limiting circuit are electrically connected in series with the buffer capacitor. The serially connected buffer capacitor, decoupling diode and current limiting circuit are connected in parallel with the DC link capacitor. This arrangement results in a voltage source converter that has an improved service reliability even in unstable power grids, without adding circuit complexity to the line input.
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“Netzrückwirkungen bei Frequenzumrichtern” (Line Feedback in Frequency Converters) by Karl Simon, printed in the German-language professional journal “etz”, vol. 10, pp. 32 and 33, 2003.
Franke Ralf-Michael
Imrich Franz
Callahan Timothy P.
Feiereisen Henry M.
Nguyen Hiep
Siemens Aktiengesellschaft
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