Ce+t Power Luxembourg Sa

Constructions Electroniques + Telecommunications

Broadband Power Solutions, En Abrege B.p.s. S.a.

Ce+t Power Luxembourg

Pierre Stassain

Paul Bleus

Fabrice Frebel

Thierry Joannes

François Milstein

Paul J M Bleus

Fernand Becker

François Mistein

The present invention relates to a single phase, non-insulated, miniaturized DC/AC power inverter having an output power density higher than 3000 W/dm, wherein said power inverter is packaged in a casing made of an external electrically conductive enclosure containing a fan blowing in an axial direction to a side face of the casing and, in a stacked elevation arrangement, successively from a bottom side to a top side, a layer of active filter capacitors, a heatsink, a layer of wideband semiconductors switches connected to a PCB with thermal vias and a layer of active filtering inductors, the fan and the component stacked arrangement being designed so as, in operation, the external temperature of the casing does not overcome 60&#xb0; C. in any point, for an ambient temperature of maximum 30&#xb0; C. under a maximum load of 2 kVA.

High power density inverter (II)

The present invention relates to a single phase, non-insulated, miniaturized DC/AC power inverter () having an output power density higher than 3000 W/dm, wherein said first (S_H), second (S_L), third (S_H) and fourth (S_L) switches are made of wide-band semiconductors and preferably of gallium nitride or GaN semiconductors; and wherein said DC/AC power inverter () further comprises: a ripple-compensating active filter comprising a third half-bridge () having a fifth switch (S_H) in series with a sixth switch (S_L), said fifth switch (S_H) being connected at one end to the positive terminal (L+) of the DC input, said sixth switch (S_L) being connected at one end to the negative terminal (L&#x2212;) of the DC input,the other end of the fifth switch (S_H) being connected to the other end of the sixth switch (S_L), defining a third common end, said third common end being connected to a first end of a LC filter, made of at least one inductor (L) and one storage capacitor (C), a second end of the LC filter being connected to the negative terminal (L&#x2212;); modulation control means of said first (S_H), second (S_L), third (S_H), fourth (S_L), fifth (S_H) and sixth (S_L) switches for providing a switch frequency comprised between 20 and 500 kHz and allowing variable phase shifts between any two of said first (), second () and third () half-bridges and allowing dead time modulation of the switches of said half-bridges (), so that to obtain a switching approaching ZVS switching, in particular to obtain switching when current crosses through zero and further to cancel switching losses and so that to allow high peak-to-peak voltage variations in the active filter, while storing corresponding energy in the storage capacitors (C), wherein the Y-capacitors of the common mode noise filter (), are referenced to a shielding being at a reference potential, said shielding being insulated from earth, said Y-capacitors having a value comprised between 100 nF and several &#x3bc;F.

High power density inverter (I)

A power supply system S comprising a power processor, having a power inputand an AC power outputwith a nominal voltage Vand a nominal current I, and a power supply safety circuitconnected in parallel to said power processorbetween said power inputand said AC power output. The purpose of the power supply safety circuitis to provide an additional current in case of a short circuit condition downstream of the AC power output, so as to trigger the opening of an individual circuit breakerconnected to the short circuited load. For this purpose the power supply safety circuitcomprises a bidirectional switch, control meansfor closing said bidirectional switchafter detecting a short circuit condition downstream of the AC power outputand a current limiter, preferably an impedance, connected in series to said bidirectional switchto limit the current that can flow through the power backup circuitto a maximum current of &#x3b1;Iwherein &#x3b1; has a value between 5 and 20, preferably between 7 and 13, and most preferably about 10. The invention also comprises a method of operation of said power supply system S.

Power supply system and method

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Malmedy, Belgium

Pierre Stassain