Thomson-csf

Thales

Michel Rincent

Claude Prevot

Pierre Esposito

Charles Richardeau

Guillaume Lebbolo

A power-factor correction circuit for a three-phase power supply is provided. The correction circuit includes a filtering unit at the input receiving the three phases of the current, at least one inductor per phase placed downstream of the filtering unit, a rectifying bridge powering a current-chopping stage. The filtering unit includes a differential-mode filtering cell including at least one inductive circuit formed of a single magnetic material in a double E, each leg of the E being surrounded by a winding.

Power factor correction circuit for three-phase power supply

The disclosure relates to the protection circuits interposed between a DC supply and a load circuit to protect the load circuit against short-circuits or reversals in polarity of the supply. The protection is obtained by means of a MOS power transistor connected between the supply and the load circuit. This transistor is turned on if it receives a voltage Vg from a bias circuit through a control circuit. The bias circuit delivers the voltage Vg only if the voltage given to it by the supply is sufficient while the control circuit turns the power transistor off if the output of the supply gets short-circuited or gives a voltage with reversed polarity.

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Issy les Moulineaux, France

Michel Rincent