Circuit simulating a diode

H - Electricity – 03 – K

Patent

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H03K 17/74 (2006.01) G06G 7/62 (2006.01)

Patent

CA 2408491

A circuit simulating the function of a diode in the sense that it conducts current in one direction and blocks current in the opposite direction, but which has a low forward voltage drop. A voltage comparator (12) and a three terminal switch (10) are connected so that the intrinsic reverse diode (11) associated with the switch is harnessed to conduct current in the direction in which it is desired to conduct current and to block current in the direction in which it is desired to block current. A voltage comparator controls the control terminal (G) of the three terminal switch to turn on the switch to conduct current and to interrupt current. Alternate embodiments of voltage comparators are disclosed. The voltage comparator may include charging and discharging transistors so that the switch turns on and off at a high speed. The invention further includes a method of conducting current in one direction and blocking current in a second direction which reduces power losses.

Circuit simulant la fonction d'une diode étant donné qu'il fait circuler le courant dans un sens et bloque le courant dans le sens contraire mais présente une chute faible de tension directe. Un comparateur de tension (12) et un commutateur à trois bornes (10) sont couplés de sorte que la diode inverse intrinsèque (11) associée au commutateur est équipée de manière à véhiculer le courant et, également, à bloquer le courant dans le sens souhaité. Le comparateur de tension commande la borne de commande (G) du commutateur à trois bornes afin d'actionner le commutateur sur une position de circulation ou d'interruption de courant. L'invention concerne des modes de réalisation différents de comparateurs de tension. Le comparateur de tension peut servir à charger et à décharger des transistors, de façon à mettre le commutateur en position de marche ou d'arrêt très rapidement. L'invention concerne, de plus, un procédé de mise en circulation de courant dans un sens et de blocage de courant dans un deuxième sens, ce qui limite les pertes de puissance.

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