摘要:
A controller for an alternating current contactor. The controller comprises: a filtering and rectification circuit (101, 102), which filters and rectifies external alternating current; an electromagnet component (103), which is driven by an output of the filtering and rectification circuit and performs actions of attraction, holding or releasing; a power transistor circuit (104), which is connected to the electromagnet component; and a microcontroller (112), which controls on or off of the power transistor circuit to control the electromagnet component so as to perform the actions of attraction, holding or releasing. The controller further comprises: a voltage control loop, which provides a voltage feedback signal to the microcontroller and the microcontroller generates a control signal according to the voltage feedback signal, wherein the control signal is a PWM control signal having different duty cycles during the attraction and holding of the electromagnet component so that the current does not exceed a predetermined current threshold during the attraction and holding of the electromagnet component; and a current control loop, which provides a current feedback signal to the microcontroller and the microcontroller turns off the power transistor circuit upon detecting an overcurrent exceeding the current threshold.
摘要:
Die Erfindung betrifft eine Vorrichtung zur Messgrössenerfassung im elektromagnetischen Antrieb eines Schaltgeräts, insbesondere eines Schützes, eine Steuer- und eine Regelvorrichtung mit einer derartigen Messgrössenerfassungsvorrichtung und Schaltgeräte mit einer derartigen Steuer- bzw. Regelvorrichtung. Eine Ausführungsform der Erfindung betrifft eine Vorrichtung zur Messgrössenerfassung im elektromagnetischen Antrieb eines Schaltgeräts mit einem induktiven Übertrager (10), dessen Primärseite (12) in Reihe mit einer Spule (14) des elektromagnetischen Antriebs geschaltet ist, und einer mit der Sekundärseite (16) des Übertragers verbundenen digitalen elektronischen Messvorrichtung (18) zum Messen einer auf die Sekundärseite übertragenen Spannung U L2 und zum Ermitteln von mindestens einer Messgröße des elektromagnetischen Antriebs abhängig von der gemessenen Spannung U L2 und bekannten Werten des Systems gemäß mindestens einer Ermittlungs- und Berechnungsfunktion.
摘要:
A relay for automatically selecting a monitoring range for monitoring a parameter of an input source and a method for monitoring a parameter of an input source can be provided whereby the relay comprises one or more terminals for coupling to the input source; a plurality of switchable circuits coupled to the one or more terminals; a processing module coupled to the plurality of switchable circuits for automatically selecting a monitoring range from a plurality of monitoring ranges based on a value of the parameter of the input source, each monitoring range associated with one or more of said switchable circuits; and a relay switch being configured to provide or disrupt electrical communication to a circuit, based on a trigger signal provided by the processing module. A signal conditioning module may also be provided for e.g. conditioning signals prior to selection of the monitoring range.
摘要:
A process for controlling and detecting the movement of an armature of an electromagnetic switching device with an excitation coil comprises the following steps: to move the armature into an operating position, a current (i) or a voltage (u1) is applied to the excitation coil (3); before the armature starts moving, the current or the voltage is increased above a value at which the armature remains in the operating position; before the armature stops moving, the current or the voltage is decreased to a given value sufficient to maintain the armature in the operating position; finally, the variations in the current or the voltage with time are determined after the value used to detect the moment at which the armature stops moving has been adjusted. This process can be used, for example, to monitor the solenoid valve of a fuel injection device in an internal combustion engine with great precision, which permits optimal control of the time and duration of injection.
摘要:
For use where there is a relay (42) controlling an AC power circuit to a load (20), such as a cooker heater, an optical sensor (64) observes arcing at the relay contacts (14). A control circuit (54) controls the time of subsequent actuation or deactuation of the relay with respect to the alternating current power circuit so that the relay contacts open or close substantially at a zero crossing point of the AC current, so as to minimise relay contact arcing.