Disclosed is an apparatus for use in wireless energy transfer, which includes a first resonator structure configured to transfer energy non-radiatively with a second resonator structure over a distance greater than a characteristic size of the second resonator structure. The non-radiative energy transfer is mediated by a coupling of a resonant field evanescent tail of the first resonator structure and a resonant field evanescent tail of the second resonator structure.

Wireless energy transfer

The present invention relates to a switching power-supply circuit comprising: rectifying and smoothing means for generating a rectified and smoothed voltage and outputting the rectified and smoothed voltage as a direct-current input voltage; an insulating converter transformer for transferring a primary-side output to a secondary side; switching means for intermittently passing on the direct-current input voltage to a primary winding of the insulating converter transformer; a primary-side resonance circuit for actuating the switching means in a voltage resonance mode; power-factor improvement means for improving a power factor by generating intermittently a rectified current based on the fed-back switching output voltage; a secondary-side resonance circuit on a secondary side of the insulating converter transformer; direct-current output voltage generation means carrying out a rectification operation in order to generate a secondary-side direct-current output voltage; and constant-voltage control means for executing constant-voltage control on the secondary-side direct-current output voltage.

Switching power supply circuit

A surgical instrument can comprise a lock movable between a locked position and an unlocked position, wherein the lock can be engaged with a drive shaft in order to prevent the drive shaft from being advanced when the lock is in its locked position. The surgical instrument can further comprise an electrical input and, in addition, a switch movable between an unactuated position and an actuated position, wherein the electrical input is electrically disconnected from an electrode when the switch is in its unactuated position, wherein the switch is configured to electrically couple the electrical input and the electrode when the switch is in its actuated position, and wherein the switch and the lock are operably coupled such that the movement of the switch from its unactuated position to its actuated position moves the lock from its locked position to its unlocked position.

Surgical instrument comprising an energy trigger lockout

A light-emitting display device includes a pixel circuit that transmits a data signal using switches responding to control signals The pixel circuit of the light-emitting display device includes first and second switching transistors serially coupled to a data line A capacitor is charged with charges in response to a data signal from the data line through the first and second switching transistors A driving transistor outputs a current corresponding to the charges in the capacitor A light-emitting diode emits light corresponding to the current One of the first and second switching transistors is turned on in response to a select signal from a first scan line and the other one is turned on in response to a control signal for controlling an operation of a second pixel circuit

Light emitting display

A surgical shaft assembly includes a proximal shaft portion, a distal shaft portion, and a control circuit. The proximal shaft portion includes a first sensor generating a first signal and a second sensor generating a second signal. The distal shaft portion includes a clutch assembly rotatable with the distal shaft portion about a longitudinal axis and relative to the proximal shaft portion. The clutch assembly is further rotatable relative to the distal shaft portion to transition the shaft assembly between two articulation states. The rotation of clutch assembly with the distal shaft portion changes the first signal, and the rotation of the clutch assembly relative to the distal shaft portion changes the second signal. The control circuit is configured to detect a change in the second signal occurring without a corresponding change in the first signal. The detected change indicates a transition between the two articulation states.

Articulation state detection mechanisms

A DC-DC converter includes a switching unit having a pair of switching devices or transistors, a resonant circuit comprising a capacitor, an inductor, and a primary coil of a converter transformer which serves as an inductor, a smoothing and rectifying circuit connected to a load in the secondary, an error amplifier for the output voltage, and a variable oscillator for varying the switching frequency according to the error voltage. The output of the variable oscillator circuit is supplied to the switching devices to provide a stabilized output voltage from the smoothing and rectifying circuit. The switching frequency during light loading is set at a frequency more than the resonant frequency which is mainly defined by the inductance and the interwinding capacitance of the secondary coil. The switching frequency to stabilize the output voltage during light loading is much higher than that during heavy loading, significantly reducing the exciting current component during light loading to enhance the energy conversion efficiency during light loading.

Complex resonant DC-DC converter and high voltage generating circuit driven in a plurality of frequency regions

In the DC/DC converter, a switching part has first and second switches serially connected from a power supply to a ground. The first and second switches switch on/off in response to first and second switching signals having a fixed frequency. The first switching signal has a phase level that does not overlap a corresponding phase level of the second switching signal. A transformer transforms a voltage applied to a first winding into a second winding in response to switching operation of the switching part, and resonates by an inductor and a capacitor of the first winding. Also, a rectifier includes a rectifying diode for rectifying the voltage from the transformer into a direct voltage. A feedback circuit detects the voltage outputted via the rectifier. Additionally, a controller controls pulse width of the first and second switching signals in a PWM mode according to the voltage detected by the feedback circuit.

High efficiency half-bridge dc/dc convertor

PROBLEM TO BE SOLVED: To protect a switching element and the entire circuit when an overcurrent appears in a resonance converter circuit. SOLUTION: When it is detected by a comparator 54 that the voltage appearing across an impedance element 53 in proportion to current which flows in a main circuit exceeds a specified threshold value 55, an oscillation frequency of an oscillator circuit is changed to a specified direction and thereby switching stress to be applied to a switching element is lessened. When it is detected by an overcurrent time measuring circuit 56 that an overcurrent state continues more than a first specified period of time, a pulse drive circuit is controlled by an intermittent oscillator circuit 57 and the power transmission is held down in such an intermittent driving state. Furthermore, when it is detected by an intermittent time measuring circuit 58 that the intermittent drive state continues more than a second specified period of time, the operation of a drive circuit 11 is stopped and thereby the operation of the entire circuit is stopped to protect the entire circuit.

Switching converter and method for protecting it from overload

Comprehensive resonance DC-DC frequency converter and high voltage generating circuit in multiple frequency area excitation

PROBLEM TO BE SOLVED: To improve a power conversion efficiency in a light load state. SOLUTION: This bridge-type DC-DC converter has a switching means 14, composed of transistors Q1 and Q2, a resonance circuit 20 composed of a capacitance element Cr, an inductance element Lr and a primary coil 22a of a converter transformer 22 which functions as an inductance element Lp, a smoothing/ rectifying circuit 24 for a load (CRT) 26 connected to a secondary coil 22b side of the transformer 22, an error amplifier 28 for an output voltage and a variable oscillator 30 which varies the switching frequency according to the error voltage. The output of the variable oscillator is supplied to the switching devices and a stabilized output voltage can be obtained from the smoothing/ rectifying circuit. A frequency which is higher than the resonance frequency, determined mainly by the inductance Lp and the inter-winding capacitance Cs of the secondary coil, is selected as the switching frequency in a light load state. The output voltage stabilizing switching frequency in a light-load state is much higher than that in the heavy-load state, so that the excitation current component in the light-load state is reduced significantly, and power conversion efficiency in the light-load state can be improved substantially, in comparison to that of the conventional constitution. COPYRIGHT: (C)2001,JPO

Kiyokazu Nagahara

Papers

Complex resonant DC-DC converter and high voltage generating circuit driven in a plurality of frequency regions

High efficiency half-bridge dc/dc convertor

Switching converter and method for protecting it from overload

Comprehensive resonance DC-DC frequency converter and high voltage generating circuit in multiple frequency area excitation

Bridge-type dc-dc converter