A control circuit used for a circuit breaker, and an electronic device. The control circuit includes a first coil, a second coil, a switch module, and an adjustable current supply module. A first end of the switch module is coupled to one end of the first coil, the other end of the first coil is coupled to one end of the adjustable current supply module, the other end of the adjustable current supply module is coupled to a second end of the switch module, a third end of the switch module is coupled to one end of the second coil, and the other end of the second coil is coupled to a fourth end of the switch module. The switch module can control a direction of a first current.

A relay device according to an embodiment of the present invention comprises: a relay unit in which a switch operates according to a voltage applied to a coil; a first control unit that controls a voltage applied to the coil by turning on and off a first switching element according to a first control signal; a first discharge unit and a second discharge unit that discharge a back electromotive force generated in the coil when the relay unit is turned off; and a second control unit including a second switching element, and controlling the back electromotive force to be discharged through the first discharge unit or the second discharge unit by turning on and off the switching element according to a second control signal.

The disclosure relates to an electromagnetic relay that comprises a yoke and an armature. The armature may be swivellably arranged on the yoke, have an open position and a contact position in relation to the yoke, and configured to be attracted by a magnetic field out of the open position into the contact position. The armature may include a first branch circuit having a first capacitor and a first exciter coil connected in series with the first capacitor, a second branch circuit having a second capacitor and a second exciter coil connected in series with the second capacitor, and a switch element arranged between the first branch circuit and the second branch circuit and having a first switch state and a second switch state. The first exciter coil and the second exciter coil may provide the magnetic field for attracting and retaining the armature.

A method for controlling an electromagnetic actuator including: applying a first control strategy in which first and third switches are kept in a closed state, whereas a second switch is switched between its open and closed states; detecting an occurrence of overconsumption of current in a coil of the actuator, by detecting that voltage measured on a control bus has exceeded a predefined voltage limit or by detecting that a duty cycle of the second switch has dropped below a threshold value; and in response, applying a second control strategy, instead of the first control strategy, in which the third switch is periodically opened in order to decrease the current supplied to the coil.

The disclosure relates to an electromagnetic relay that comprises a yoke and an armature. The armature may be swivellably arranged on the yoke, have an open position and a contact position in relation to the yoke, and configured to be attracted by a magnetic field out of the open position into the contact position. The armature may include a first branch circuit having a first capacitor and a first exciter coil connected in series with the first capacitor, a second branch circuit having a second capacitor and a second exciter coil connected in series with the second capacitor, and a switch element arranged between the first branch circuit and the second branch circuit and having a first switch state and a second switch state. The first exciter coil and the second exciter coil may provide the magnetic field for attracting and retaining the armature.

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 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 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 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.

The electromagnetic coupler uses a coil to induce voltage onto a transistor. By controlling the amount of current that flows through the coil, one is able to can control the strength of the magnetic field emitted by the inductor. And by the controlling the q-point of the transistor, the amount voltage and current induced onto the transistor it can then potentially be used as a switch or an amplifier without any electrical/electronic connection to the internal coil. The use of a transistor enables high speed switching and the potential amplification of communication signals.