Auteur
Sgs-Thomson Microelectronics
Œuvres
Documents
New triacs with high commutation and dv dt performances are now available on the market Generally these triacs are only triggerable in the first quadrants case of SNUBBERLESS and LOGIC LEVEL triacs as shown in figure This paper describes a trigger circuit supplying a negative gate current for quadrants II and III implemented in a system using a positive power supply Without a new design just by adding a capacitor and a diode new W series triacs can replace conventional triac
Documents
Rapports de stage
New triacs with high commutation and dv dt performances are now available on the market Generally these triacs are only triggerable in the first quadrants case of SNUBBERLESS and LOGIC LEVEL triacs as shown in figure This paper describes a trigger circuit supplying a negative gate current for quadrants II and III implemented in a system using a positive power supply Without a new design just by adding a capacitor and a diode new W series triacs can replace conventional triac
5 pages
English
Documents
In today's power converter the commutation speed of the transistor and the operating frequencies are higher and higher Fast diodes used for freewheel snubber and rectifier functions become one of the main causes of the power losses In the range of 600V 1200V SGS THOMSON has developed a new family of ultrafast diodes Taking into account these new constraints which are different from one application to another SGS THOMSON proposes two series TURBOSWITCH ”A” and TURBOSWITCH ”B” The specific characteristics of these two series offer to the designer a double choice allowing him to use the best diode in this application
Documents
Rapports de stage
In today's power converter the commutation speed of the transistor and the operating frequencies are higher and higher Fast diodes used for freewheel snubber and rectifier functions become one of the main causes of the power losses In the range of 600V 1200V SGS THOMSON has developed a new family of ultrafast diodes Taking into account these new constraints which are different from one application to another SGS THOMSON proposes two series TURBOSWITCH ”A” and TURBOSWITCH ”B” The specific characteristics of these two series offer to the designer a double choice allowing him to use the best diode in this application
5 pages
English
Documents
In the last few years the use of triacs has spread to all areas of electronics including domestic appliances and industrial applications The use of triacs has been traditionally limited by their switching behavior in applications where there is a risk of spontaneous firing after conduction In order to obtain the required reliability in today's equipment the designer must take a certain number of precautions: over dimensioning of the device switching aid networks snubber significant margin of security of the junction temperature etc This generally involves additional costs After a brief discussion of commutation problem when a triac is turned off this article will describe the progress made in this area and the newest possibilities now offered to triac user thanks to the new series Logic Level and SNUBBERLESS triac
Documents
Rapports de stage
In the last few years the use of triacs has spread to all areas of electronics including domestic appliances and industrial applications The use of triacs has been traditionally limited by their switching behavior in applications where there is a risk of spontaneous firing after conduction In order to obtain the required reliability in today's equipment the designer must take a certain number of precautions: over dimensioning of the device switching aid networks snubber significant margin of security of the junction temperature etc This generally involves additional costs After a brief discussion of commutation problem when a triac is turned off this article will describe the progress made in this area and the newest possibilities now offered to triac user thanks to the new series Logic Level and SNUBBERLESS triac
10 pages
English
