A superconducting AC switch system includes a switch network configuration comprising a Josephson junction (JJ) coupled to a transmission line having a transmission line impedance, and a magnetic field generator that is configured to switch from inducing a magnetic field in a plane of the JJ, and providing no magnetic field in the plane of the JJ. An AC input signal applied at an input of the switch network configuration is passed through to an output of the switch network configuration in a first magnetic state, and substantially reflected back to the input of the switch network configuration in a second magnetic state. The first magnetic state is one of inducing and not inducing a magnetic field in a plane of the JJ, and the second magnetic state is the other of inducing and not inducing a magnetic field in a plane of the JJ.

An actuator assembly comprises: a rotatable shaft, a magnet mounted to the rotatable shaft, non-magnet material positioned between the magnet and the shaft, a rotary sensor configured to be responsive to rotation of the magnet for generating a signal, and a housing comprising a magnetic shield surrounding at least a part of the rotary sensor and at least a part of the magnet mounted to the shaft to shield the sensor and the magnet from an external magnetic field. The actuator assembly further comprises a magnet holder fixing the magnet to the shaft. The magnetic shield encompasses the magnetic flux from the magnet to the rotary sensor and also shields the rotary sensor from any external magnetic field such as stray field or magnetic field from the outside of the housing. The non-magnetic material may reduce leakage magnetic flux from the magnet to the shaft.

Disclosed herein are systems and methods for optimizing transformer exciting current and loss test results by dynamically managing core magnetic state. In an exemplary embodiment, a method includes injecting a direct current (DC) offset voltage; adjusting at least one of a polarity and a magnitude of the DC offset voltage while monitoring a test current for one or more criteria; and bypassing a source of the DC offset voltage when the test current has satisfied the one or more criteria, whereby residual magnetism, if any, of a core of the transformer is minimized.

A magnetic actuator having an actuator element, a coil for actuating the actuator element, and a circuit for energizing the coil, the circuit having a supply voltage input to which a supply voltage for energizing the coil is appliable, and the circuit being configured to provide a clocked energization of the coil in a holding current reduction phase and to adapt a duty cycle of the clocked energization as a function of the supply voltage.

A driving backplane, a transfer method for a light-emitting diode chip (21), and a display apparatus. The driving backplane comprises: a base substrate (10), a driving circuit, a plurality of electromagnetic structures (13), and a plurality of contact electrodes (12). The plurality of electromagnetic structures (13) in the driving backplane are symmetrically arranged relative to a first straight line (L1) and a second straight line (L2). A current signal can be applied to each electromagnetic structure (13) by means of the driving circuit. Stress generated by a transfer carrier plate (20) according to the magnetic force of each electromagnetic structure (13) moves the transfer carrier plate (20). When the transfer carrier plate (20) is stress balanced in each direction parallel to the surface of the transfer carrier plate (20), the light-emitting diode chip (21) is precisely aligned to corresponding contact electrodes (12).

An electric circuit arrangement for energizing a magnet of a magnetic resonance imaging facility includes a first circuit part, a second circuit part and a control facility. In an embodiment, the first circuit part is designed to generate a direct voltage as an DC link voltage from an alternating voltage and the second circuit part is designed as a current source fed by the DC link voltage. The second circuit part includes a down converter controllable by the control facility, a transformer switchable by the control facility and a rectifier. A primary current is generatable from the DC link voltage via the down converter. The primary current is feedable by a switching facility, switched by the control facility into a primary side of the transformer, and a secondary current for energizing the magnet is generatable via the rectifier connected to a secondary side of the transformer.

This disclosure describes systems, methods, and apparatus for waveform control, comprising: a power supply having an input terminal, and at least one output terminal for coupling to a load; a controller; a variable inductor coupled to at least one of the output terminals, the variable inductor comprising a first magnetic core having a plurality of arms, including at least a first inductor arm and a first control arm, wherein an inductance winding having one or more turns is wound around the first inductor arm, and wherein a first control winding comprising one or more turns is wound around the first control arm; and a DC current source coupled to the first control arm and the controller, the controller configured to adjust a DC bias applied by the DC current source to the first control arm to control an output waveform at the at least one output terminal.

A constant-current controller that supplies a constant-current to a solenoid driver for use with an electromechanical device. The controller comprises a PCB containing a constant-current control circuit. The circuit comprises a GaNFET primary switch and a secondary switch. The PCB is integrated with and made a part of the solenoid driver. A standard electromechanical device may be converted to a constant-current controlled electromechanical device by exchanging the solenoid driver.

An adopting core device including a main board, a server connector module, a leaking sensor, and an electromagnet device is proposed in the current application. In an embodiment, a main board including a fluid channel assembled by a manual mating connector through hoses and a blind mating connector fixed on the other side. In an embodiment, the manual mating connector is connected to a rack connector of a rack manifold of an electronic rack coupled to an external cooling fluid source to receive and to return cooling fluid from and to the external cooling fluid source. For example, the blind mating connector is capable of being engaged with or disengaged from a server fluid connector of a server chassis. In an embodiment, the server chassis comprises a leaking sensor configured to detect leakage of the cooling fluid within the server chassis.

A magnetic release assembly includes a housing defining a cavity, a permanent electromagnet positioned within the cavity, and a microcontroller electronically coupled with the permanent electromagnet. The microcontroller is configured to selectively provide power to the permanent electromagnet. A timer board is in communication with the microcontroller. A power source is electronically coupled with the microcontroller, the permanent electromagnet, and the timer board. The microcontroller is configured to provide power to the permanent electromagnet in response to an alarm from the timer board.