摘要:
A system for measuring soft starter current includes a current monitoring system including a controller and a current transfer device that includes a first thyristor and a first conductor coupled to the first thyristor and configured to convey a first current flowing through the first thyristor, wherein the first current includes current flowing through the first thyristor when the first thyristor is in an off state. The system also includes a first current sensor configured to sense the first current and a first current measurement circuit coupled to the first current sensor and coupleable to the controller and configured to output a first output value to the controller representative of the first current flowing through the first thyristor. The controller is configured to determine an impending inoperability of the first thyristor based on the first current and alert a user if the first current indicates the impending inoperability.
摘要:
L'invention concerne un circuit de commande d'un interrupteur bidirectionnel (TR) référencé à une première référence (G2) par un circuit de commande (µP) alimenté par une première tension (V1) et référencé à une deuxième référence (G1). La tension d'alimentation (V1) du circuit de commande est connectée par une diode (D1) à un circuit de couplage (10) comprenant un noeud (11), ce noeud étant relié :
au collecteur d'un transistor NPN (T1) dont l'émetteur est relié à la deuxième référence (G1) et dont la base reçoit la sortie du circuit de commande, à une première borne d'un condensateur (C) dont la deuxième borne est reliée à la première référence (G2), à l'émetteur d'un transistor PNP (T2) dont la base est reliée au collecteur du transistor (T1), et dont le collecteur est relié à la borne de commande de l'interrupteur bidirectionnel (TR).
摘要:
A 2-terminal solid state electrical switch is provided which can be connected in series with a load device in a the same manner as a conventional mechanical-contact switch, does not leak current during an "OFF" state, and operates from a dynamic pulse run mode during an "ON" state. The two-terminal solid state electrical switch of the present invention requires neither a power supply to operate, nor any mechanical movement and contact points. Consequently, no spark, arc or any mechanical noise is created in the solid state electrical switch's operation, nor does it corrode, thus allowing it to be used in a hostile environment. The solid state switch of the present invention can be put to uses not practical for conventional mechanical-contact switches, such as to control multi-appliances, as static circuit breakers, contactors and relays for fire-proof, explosion-proof, water-proof, anti-chemical, anti-corrosion, humidity resistant, dust resistant, anti-vibrations and heavy duty frequently operations. Further, a unique initialization circuit in the solid switch of the present invention resets the switch intelligently to a suitable operating mode after a power interruption, thus avoiding accidents that may endanger property and lives. The present invention also provides a highly isolated multi-point random remote control switch/relay suitable for wide industrial and other applications.
摘要:
L'invention concerne un composant semiconducteur monolithique comprenant un premier thyristor (Th1) ayant une gâchette, une anode et une cathode, la gâchette étant reliée à la cathode par une première résistance (RG) et à l'anode par la connexion en série d'une diode Zener basse tension (Z) et d'un deuxième thyristor (Th2). Les thyristors (Th1, Th2) sont à structure verticale, et la diode Zener (Z) est de type latéral et est réalisée dans le caisson de gâchette (25) du premier thyristor, la cathode de la diode Zener étant reliée à la cathode du deuxième thyristor par une métallisation (30) constituant une borne de sortie (2).
摘要:
A pair of static induction thyristors (1, 2), which are coupled in parallel in the opposite bias directions between an AC power source (13, 105, 400, 501) and a load (14, 108, 409, 504), is turned on by a light signal and is turned off by natural commutation, a light signal or an electric signal. The turn-off light signal is generated within a phase angle of 90° in the time axis around the zero-cross point of the AC voltage from the AC power source (13, 105, 400, 501).
摘要:
A driver circuit (122) responsive to an input AC voltage for applying the input AC voltage for a predetermined duration to a load (118). The driver circuit (122) includes means for receiving an input AC voltage and means (140) for providing a DC voltage related to the input AC voltage. The driver circuit (122) is characterized by timing means (160) responsive to the DC voltage for generating a continuous control signal for a selected time period which has a duration corresponding to the predetermined duration, and control means (178) receiving the control signal over the selected time period for applying the input AC voltage to the load (118) through the control means (178) when the input AC voltage is in the positive portion of its cycle, control signal applied to the control means (178) when the input AC voltage is in both the positive and negative portions of its cycle.