A device for the command and control of the electric power supply of windings of an electromagnetic actuator, comprising a plurality of electronic means configured to receive at the input either a direct current feeding voltage or alternatively an alternating current feeding voltage and to generate at the output a first digital command signal triggering an activation phase of the electromagnetic actuator in which at least one of the windings is powered, for a first predefined and adjustable time interval, with an activation current, a second digital command signal triggering a maintenance phase of the electromagnetic actuator in which the windings are powered with a maintenance current having an intensity lower than the activation current, and a third digital command signal triggering a third phase of deactivation of the electromagnetic actuator in which the power supply of the windings is interrupted for a second predefined and adjustable time interval.

Provided herein is an improved solenoid electrical switch. In some embodiments, a solenoid electrical switch may include a plunger at least partially disposed in a central aperture of a solenoid for rotation and axial reciprocation between at least two positions into and out of the central aperture relative to a magnetic coupling member. The plunger may include a first component including a main body and a central slot within the main body, and a second component at least partially disposed within the central slot, wherein the second component may include an engagement surface engaged with an inner surface of the central slot.

A coil drive device energizes an operation coil to close an electromagnetic contactor. A rectifier outputs, to a power supply line, an input voltage obtained by full-wave rectification of an AC voltage supplied from a main power source. A controller controls on and off of a switching element connected to a power supply line in series with the operation coil. The controller controls a duty ratio that is an on period ratio of the switching element in each switching period in accordance with a value of a parameter calculated from a detected value of the input voltage, in at least a partial period after start of energization of the operation coil in response to a close command for the electromagnetic contactor.

A device includes: a controller configured to output a contactor control signal for controlling an operation of a contactor; a system basis unit configured to monitor a state of the controller and to output a safety detection signal; an operation maintaining unit including a first level shifter configured to shift a voltage level of the safety detection signal, a second level shifter configured to shift a voltage level of the contactor control signal, a retention output unit configured to compare the voltage level of the first level shifter with the voltage level of the second level shifter and to output a retention output signal, and a timer output unit configured to output a timer output signal to output the retention output signal for a preset time; and a contactor driver configured to output a contactor driving signal based on the contactor control signal and the retention output signal.

Provided is an electromagnetic switch control device capable of stabilizing a contact pressure by predicting a near-future value of an operation coil current and performing control such that the near-future value does not fall below a holding current threshold value by a control unit. An electromagnetic switch control device 1 opens and closes 13 by an electromagnetic force corresponding to energization of operation coils 16 and 17, and includes PWM control units 21 to 23 that perform PWM pulse width modulation control of a current value A flowing through the operation coils 16 and 17. The PWM control units 21 to 23 estimate the near-future predicted current value flowing through the operation coils 16 and 17 by using a terminal voltage V of the operation coils 16 and 17, and perform PWM control based on the estimated current value. The predicted current value Y is estimated by using an impedance Z of the operation coils 16 and 17. The impedance is a variable obtained by current values A1 and A2 and terminal voltages V1 and V2 of the operation coils 16 and 17, and a constant approximated over a predetermined period from a latest past to a present time is used. The impedance is updated for each predetermined period.

A relay device includes a coil portion, a fixed contact, a spring, a moving contact and a drive circuit. The drive circuit controls the electromagnetic force of the coil portion to be a first electromagnetic force when switching the fixed contact and the moving contact in a contact state to a non-contact state. The drive circuit controls the electromagnetic force of the coil portion to be a second electromagnetic force that is larger than the first electromagnetic force after a lapse of a first time from start of control of the electromagnetic force of the coil portion to be the first electromagnetic force. The drive circuit controls the electromagnetic force of the coil portion to be reduced with time after a lapse of a second time from start of control of the electromagnetic force of the coil portion to be the second electromagnetic force.

A relay device includes a coil portion, a fixed contact, a spring, a moving contact and a drive circuit. The drive circuit controls the electromagnetic force of the coil portion to be a first electromagnetic force when switching the fixed contact and the moving contact in a contact state to a non-contact state. The drive circuit controls the electromagnetic force of the coil portion to be a second electromagnetic force that is larger than the first electromagnetic force after a lapse of a first time from start of control of the electromagnetic force of the coil portion to be the first electromagnetic force. The drive circuit controls the electromagnetic force of the coil portion to be reduced with time after a lapse of a second time from start of control of the electromagnetic force of the coil portion to be the second electromagnetic force.

Device for the command and control of the electric power supply of one or more windings of an electromagnetic actuator, comprising a plurality of electronic means configured to receive at the input either a direct current feeding voltage or alternatively an alternating current feeding voltage and to generate at the output a first digital command signal suitable for triggering an activation phase of the electromagnetic actuator in which at least one the one or more windings is powered, for a first predefined and adjustable time interval, with an activation current, a second digital command signal suitable for triggering a maintenance phase of the electromagnetic actuator in which the one or more windings are powered with a maintenance current having an intensity lower than the activation current, and a third digital command signal suitable for triggering a third phase of deactivation of the electromagnetic actuator in which the power supply of the one or more windings is interrupted for a second predefined and adjustable time interval.

A relay control device includes a coil, a movable iron armature that is switched from an open state to a closed state when the coil is excited, a switching current output circuit that applies first current for switching the movable iron armature from the open state to the closed state to the coil, and a holding current output circuit that applies second current for holding the movable iron armature in the closed state to the coil. The switching current output circuit applies the first current to the coil when a first time has elapsed from when the second current is started to be applied to the coil, and the value of the second current is lower than the value of the first current.

The disclosure relates to an electromagnetic relay module, comprising a first circuit branch comprising a first capacitor and a first relay connected in series with the first capacitor, a second circuit branch comprising a second capacitor and a second relay connected in series with the second capacitor, a switching element which is arranged between the first circuit branch and the second circuit branch and comprises a first switching state and a second switching state. In the first switching state of the switching element the first circuit branch and the second circuit branch are arranged in a parallel connection. In the second switching state of the switching element the first relay and the second relay are arranged in a series connection. The switching element is configured to change from the first switching state to the second switching state in the switch-on process of the relay module