Abstract: A keyboard device includes a base plate and a plurality of keyswitches disposed on the base plate. At least one of the keyswitches includes a keycap, two linkages, and two magnetic attraction members. The linkages are connected between the base plate and the keycap and configured to guide the movements of the keycap toward and away from the base plate. The magnetic attraction members are rotatably connected to the linkages, respectively, and are configured to attract each other. When the magnetic attraction members abut against each other, the keycap is at a highest position relative to the base plate. When the keycap moves toward the base plate from the highest position, the magnetic attraction members are separated from each other.

Abstract: An electric motor (1) comprising an armature (10) having a plurality of teeth (20), and slots (30) configured between the teeth (20), at least one winding (40), which is constituted by a winding conductor (42), wherein at least part of the winding (40) is accommodated within one of the slots (30), a first guide (52) and a second guide (52), respectively having a spacer (56) and a guide slot (54), configured within the slot (30), wherein a winding conductor section (44) of the winding conductor (42) is guided at least in one of the guide slots (54), and wherein the spacer (56) separates the winding conductor section (44) from the winding (40), wherein the free ends of the spacer (56) and the openings in the guide slots (54) are configured in a mutually facing arrangement.

Abstract: A contact device includes: a contact block which includes a fixed contact, and a movable contactor including a movable contact formed to come into and out of contact with the fixed contact; a driving block including a driving shaft which moves the movable contactor, the driving block configured to drive the driving shaft so that the movable contact can come into and out of contact with the fixed contact; and a yoke disposed on one side of the movable contactor in a driving direction and fixed to the movable contactor. One of the yoke and the movable contactor includes a projection projected to the driving direction, and the other of the yoke and the movable contactor includes an insertion hole in which to insert the projection.

Abstract: A circuit breaker has a first stationary contact connected to line power and a second stationary contact connected to neutral. A first moveable contact coupled to a load power terminal, is mounted on a moveable actuator and juxtaposed with the first stationary contact to form a power circuit when the first moveable and first stationary contacts are closed. A second moveable contact connected to a load neutral terminal is mounted on the moveable actuator juxtaposed with the second stationary contact to form a neutral circuit when the second moveable and second stationary contacts are closed. The movable actuator moves the first and second moveable contacts in unison to open the power circuit between the first stationary and first moveable contacts and to simultaneously open the neutral circuit between the second stationary and second moveable contacts, in response to actuation of an operating handle or to sensing a tripping event.

Abstract: A superconducting dipole magnet structure that includes coil boxes, a dewar and a support device is provided, wherein each of the coil boxes is of a one-piece structure in which a superconducting coil is provided, wherein the superconducting coils are opposite to each other so that a uniform dipole magnetic field is generated when the two superconducting coils are energized, and wherein the support device is fixed to the dewar and supports the coil box in the way of point contact.

Abstract: Provided is a transformer (1), which includes: a core (10) which forms a magnetic circuit and has a middle leg (10a) and a plurality of side legs (10b, 10c) branched from the middle leg (10a); primary windings (11) respectively wound around a first winding leg (10a) and a second winding leg (10b), which are selected from the middle leg (10a) and the side legs (10b, 10c); and a secondary winding (12) wound around either of the first winding leg (10a) or the second winding leg (10b), wherein a first magnetic flux generated by the primary windings (11) from the first winding leg (10a) and a second magnetic flux generated by the primary windings (11) from the second winding leg (10b) differ from each other by a predetermined value or more at a position at which the fluxes do not intersect with the secondary winding (12).

Abstract: A solenoid assembly of a fuel pump is disclosed, including a housing having an open end and a partly closed end; a pole piece fixedly disposed within the housing; a bobbin assembly disposed within the housing and including a coil disposed proximal to the pole piece; and a bobbin retainer disposed between the open end of the housing and the bobbin assembly, a radially outer surface of the bobbin retainer contacting the housing. A portion of the housing which is adjacent the bobbin retainer has an outer surface that is recessed and an inner surface that protrudes against the bobbin retainer. The portion is created by deforming the housing to create the protrusion on the inner surface of the housing. The housing inner surface protrusion provides a press fit engagement with the bobbin retainer.

Abstract: Direct-current-to-direct-current (DC-DC) power converters that include two or more multi-quadrant, multi-level, DC-DC, switching converter subcircuits, connected in parallel at respective input and output sides, so as to provide a multi-channel, multi-quadrant, multi-level configuration, are disclosed. The DC-DC power converters further include a control circuit configured to control the switching converter subcircuits so that corresponding switching semiconductors in each of the switching converter subcircuits are switched in an interleaved manner. In some embodiments, each of the switching converter subcircuits is a three-level, neutral-point-clamped, four-quadrant DC-DC converter circuit. In other embodiments, each of the switching converter subcircuits is a three-level, neutral-point-clamped, two-quadrant DC-DC converter circuit. In any of these embodiments, a filter capacitor may be connected between across a pair of output terminals at the output sides of the switching converter subcircuits.

Abstract: A laminate substrate inductor reduces insertion loss and improves isolation while reducing the area for integrating the laminate substrate inductor. The laminate substrate includes a spiral trace. The laminate substrate also includes a first capture pad at a first end of the spiral trace. The first end is located at a corner of the spiral trace. The first capture pad is substantially within a bounding box of the spiral trace. At least a portion of the first capture pad and an outer edge of the spiral trace have a same distance from a ground.

Abstract: An EM driver for accelerating an object may be configured as an EM rifle for accelerating, rotating to spin-stabilize, and releasing a projectile. A core includes a stator coil, forward and reverse coils, a railed shaft, and a transfer shaft. The stator coil generates a first EM field, and the forward and reverse coils generate second and third EM fields which interact with the first EM field to accelerate the armature in forward and reverse directions, respectively. The railed shaft is elongated along a central axis through the armature and includes multiple rails arranged helically around a central shaft. The armature remains in contact with the rails during acceleration so as to impart a turning motion. The transfer shaft is physically coupled with and projects forwardly from the armature and transfers to the projectile the acceleration and the turning motion of the armature in the forward direction.

Abstract: In one embodiment, a resonant converter circuit may be formed to include a light-load control circuit that forms a sequence to control one or more transistors wherein the sequence includes a drive interval having a drive pattern to drive the one or more transistors and a subsequent Off-interval wherein the one or more transistors are switched. A first circuit of the light-load control circuit may be configured to form the drive pattern as a repeated sequence of a pulse set that sequentially enables the one or more transistors with a base set followed by a number of non-switching intervals wherein each non-switching interval is a period of a signal formed in response to driving the one or more transistors with the base set.

Abstract: An EM driver for accelerating an object may be configured as an EM rifle for accelerating, rotating to spin-stabilize, and releasing a projectile. A core includes a stator coil, forward and reverse coils, a railed shaft, and a transfer shaft. The stator coil generates a first EM field, and the forward and reverse coils generate second and third EM fields which interact with the first EM field to accelerate the armature in forward and reverse directions, respectively. The railed shaft is elongated along a central axis through the armature and includes multiple rails arranged helically around a central shaft. The armature remains in contact with the rails during acceleration so as to impart a turning motion. The transfer shaft is physically coupled with and projects forwardly from the armature and transfers to the projectile the acceleration and the turning motion of the armature in the forward direction.

Abstract: An embedded coil assembly embodiment includes a ferrite ring having an annular axis. The ferrite ring is positioned on a conductive metal surface. A plurality of separate, spaced apart conductive structures extend over the ferrite ring and are attached to the conductive metal surface in a first region of the conductive surface positioned radially outwardly of the annular axis of the ferrite ring and in a second region of the conductive surface positioned radially inwardly of the annular axis of the ferrite ring. An encapsulation layer covers, the ferrite ring and at least a portion of the plurality of conductive structures.

Abstract: A dial device includes a base, a cover, a column, a magnet, a magnetic sensor and a signal processing circuit. The cover includes a cap portion and a side wall vertically extending from the cap portion. The column surrounded by the wall includes a first end for connecting to the base and a second end for connecting to the cover. The magnet surrounds the column and is disposed on the base or the cover. The magnetic sensor is disposed on a side surface of the column and coupled to the signal processing circuit. When the cover rotates relative to the base, the magnet rotates around the magnetic sensor, and the magnetic field strengths sensed by the magnetic sensor vary. The signal processing circuit determines the relative rotation direction between the cover and the base according to the difference of the magnetic field strengths sensed by the magnetic sensor.

Abstract: A start-up circuit to discharge EMI filter is developed for power saving. It includes a detection circuit detecting a power source for generating a sample signal. A sample circuit is coupled to the detection circuit for generating a reset signal in response to the sample signal. The reset signal is utilized for discharging a stored voltage of the EMI filter.

Abstract: A display device includes a display panel which displays an image in a normal mode or low power mode. A DC-DC converter supplies a source driving voltage to the data driver, and supplies a first power voltage to the power line of the display panel in the normal mode. The data driver supplies a first auxiliary power voltage to the power line of the display panel in the low power mode. The DC-DC converter gradually changes the voltage level of the first power voltage to a reference output voltage level over a first period when the display panel initially enters into the normal mode, and changes the voltage level of the first power voltage to the reference output voltage level over a second period shorter than the first period when the mode of the display panel is switched from the low power mode to the normal mode.

Abstract: A replaceable key structure includes a key holder and a circuit board. The key holder is disposed above a circuit board. The key holder is formed with a mounting slot for selectively receiving a first key module or a second key module therein. A magnetic sensor and a contact connector are disposed on the circuit board positionally corresponding to the mounting slot of the key holder. The first key module has a shaft, and a magnetic element disposed on the bottom of the shaft. The magnetic sensor can output an analog signal when the magnetic element approaches. The second key module has a trigger switch which has two electrical terminals disposed on the bottom surface of the second key module. When the second key module is installed in the mounting slot, the electrical terminals can be electrically connected to the contact connector.

Abstract: A superconducting magnetic energy storage system (SMES). The SMES includes a toroidally wound super conducting magnet having a toroidal magnetic core with a charging winding and a discharging winding. The charging winding and discharging winding are wound on the toroidal magnetic core. The SMES also includes a DC power source, the DC power source operable to provide DC current to the charging winding of the toroidally wound superconducting magnet, and a modulator operably connected to the DC power source and the charging winding, the modulator operable to modulate at least a portion of the DC current applied to the charging winding of the superconducting magnet. The energy is stored in a magnetic field of the superconducting magnet by applying a current to the charging winding of the superconducting magnet, and energy is withdrawn from the magnetic field by a current flowing in the discharging winding.

Abstract: A movable iron core, a primary attracting and holding coil, a resistor electrically connected to an upstream start-up electric contact, and an auxiliary attracting and holding coil electrically connected to the upstream start-up electric contact are included. The movable iron core displaces a pinion from a separated position to a contact position. After the pinion is displaced from the separated position to the contact position, the upstream start-up electric contact is electrically disconnected from another start-up electric contact to cut off a current to the motor, and the movable iron core displaces the pinion from the contact position to an engaged position with the magnetomotive force of the primary attracting and holding coil and a magnetomotive force of the auxiliary attracting and holding coil. After the pinion is displaced from the contact position to the engaged position, main electric contacts are electrically connected to resume electric connection to the motor.

Abstract: The disclosure relates to a flyback converter, a control circuit and a control method therefor. In the control method, a power stage circuit is controlled at a light load to operate alternatively in a pulse-width modulation mode (e.g., a constant switching frequency mode) and in a constant on time mode, in accordance with a voltage compensation signal. Thus, output energy may decrease rapidly and smoothly, without need for the control circuit to stop working. The flyback converter has increased efficiency at the light load and decreased output voltage ripple.