Assembly structure of self-turn-off switching device and snubber circuit therefor

An assembly structure of a self-turn-off switching device and a first snubber circuit and a second snubber circuit connected in parallel with said self-turn-off switching device, said first snubber circuit being composed of at least a series circuit of a first snubber diode and a first snubber capacitor, and said second snubber circuit being composed of at least a series circuit of a second snubber diode and a second snubber capacitor, said assembly structure comprising:

• said self-turn-off switching device;
• said first snubber diode;
• said first snubber capacitor;
• said second snubber diode;
• said second snubber capacitor;
• a conductive heat sink on which said self-turn-off switching device is mounted at a first surface thereof, said first snubber diode is mounted at a first surface thereof and said second snubber diode is mounted at a first surface thereof, for cooling said self-turn-off switching device and said first and second snubber diodes and for connecting said first surface of said self-turn-off switching device and said first surfaces of said first and second snubber diodes;
• a first conductor on which said first snubber diode is mounted at a second surface thereof opposite to said first surface of said first snubber diode for connecting said second surface of said first snubber diode and a first terminal of said first snubber capacitor;
• a second conductor positioned in parallel with said first conductor for connecting a second terminal of said first snubber capacitor and a second surface of said self-turn-off switching device opposite to said first surface thereof;
• a first insulating spacer positioned between said first conductor and said second conductor for insulating said first conductor and said second conductor;
• a third conductor on which said second snubber diode is mounted at a second surface thereof opposite to said first surface of said second snubber diode for connecting said second surface of said second snubber diode and a first terminal of said second snubber capacitor;
• a fourth conductor positioned in parallel with said third conductor for connecting a second terminal of said second snubber capacitor and said second surface of said self-turn-off switching device opposite to said first surface thereof;
• and
• a second insulating spacer positioned between said third conductor and said fourth conductor for insulating said third conductor and said fourth conductor.

An assembly structure of a self-turn-off switching device and a plurality of snubber circuits connected in parallel with said self-turn-off switching device, each of said snubber circuits being composed of at least a series circuit of a snubber diode and a snubber capacitor, said assembly structure, comprising;

• said self-turn-off switching device;
• said plurality of said snubber diodes;
• said plurality of said snubber capacitors;
• a conductive heat sink in which said self-turn-off switching device is mounted at a first surface thereof and each of said snubber diodes is mounted at a first surface thereof, for cooling said self-turn-off switching device and said snubber diodes and for connecting said first surface of said self-turn-off switching device and said first surfaces of said snubber diodes;
• a plurality of first conductors, on each of which one of said snubber diodes is mounted at a second surface thereof opposite to said first surface of one of said snubber diodes for connecting said second surface of one of said snubber diodes and a first terminal of one of said snubber capacitors, respectively;
• a plurality of second conductors, each being positioned in parallel with one of said first conductors for connecting a second terminal of one of said snubber capacitors and a second surface of said self-turn-off switching device opposite to said first surface thereof, respectively;
• and
• a plurality of insulating spacers, each being positioned between one of said first conductors and one of said second conductors for insulating one of said first conductors and one of said second conductors, respectively.