2311 results about "Positive power" patented technology

A two-optic accommodative lens system. The first lens has a negative power and is located posteriorly against the posterior capsule. The periphery of the first optic contains a pair of clasps. The second optic is located anteriorly to the first optic and is of a positive power. The peripheral edge of the second optic contains a pair of locking arms that fit into the clasps contained on the periphery of the first optic to lock the second optic onto the first optic, but allow for rotation of the arms within the clasps. Hinge structures on the locking arms allow the second optic to move relative to the first optic along the optical axis of the lens system in reaction to movement of the ciliary muscle.

A method and apparatus for carrying out variable timing exhaust gas recirculation is disclosed for use during both positive power and retarding operation of an internal combustion engine. Motion or energy is derived from an engine component and stored as potential energy. The stored energy is selectively applied to a valve actuator to carry out exhaust gas recirculation in an engine cylinder. The energy derived from the engine may be stored and selectively applied to the valve actuator with an electronically controlled trigger valve. The valve actuator may be a slave piston having an inner core and an outer sleeve capable of opening the valve of the cylinder in response to independent exhaust gas recirculation and compression release hydraulic systems.

A highly efficient class-G amplifier includes an amplifier circuit coupled between a positive power rail and a negative power rail to amplify an audio input signal of the class-G amplifier, and a boost inverting power converter to convert a supply voltage to a positive rail voltage and a negative rail voltage on the positive and negative power rails. The boost inverting power converter includes a boost inverting power stage coupled to the positive and negative power rails, and a controller to switch the boost inverting power stage between a boost mode and an inverting mode. An audio level detector detects the audio input signal for the controller to adjust the positive and negative rail voltages. The class-G amplifier has higher efficiency and requires lower cost because it does not need a charge pump.

In one aspect, the invention provides methods and apparatus facilitating an adjustable-stiffness prosthesis or orthosis (including approximations to arbitrarily definable non-linear spring functions). Spring rates may be varied under no-load conditions during a walking gate cycle to minimize power consumption. In another aspect, the invention provides methods and apparatus for outputting positive power from a prosthesis or orthosis, facilitating high-performance artificial limbs. In one embodiment of the invention, the positive power is transferred from a functioning muscle to the prosthesis or orthosis, which mimics or assists a non-functioning or impaired muscle. In another embodiment of the invention, the positive power comes from an on-board power source in the prosthesis or orthosis.

A method and apparatus for renewable power generation utilizes the chemical potential dissimilarity between solutions of differing ionic formulations. A train is formed by a sequentially ordered set of a plurality of cells in which each successive cell is related to the preceding cell. Each cell has pumping means and hydro-power generation turbine means to form a closed hydraulic loop configured for specified volumetric and flow capacity. Adjacent cells share semipermeable membranes. Each cell is charged with a brine of specified ionizable inorganic salt quantity and type with the brine being cycled in a controlled concentration-pressure loop, with each of the cells operating at progressively increasing concentration and osmotic pressure ratio. A continuous and constant flow rate of substantially salt-free permeate flux is maintained across each cell, the flux being osmotically induced from low salt concentration water being fed at the first cell in the train and exiting at the last cell along with the discarded high concentration water brine. The salt-free permeate flux is continuously induced, in symbiotic mode, through the shared membranes, driven by the chemical influence of concentration potential field bounded by water of low to no salt concentration on one end of the train and by brine of high salt concentration on the other end of the train with sufficient concentration difference to provide driving force for said plurality of cells, while maintaining adequate concentration difference between adjacent cells to enhance osmosis function, as well as defining a concentration ratio within each cell to ensure a net positive power generation.

An imaging lens is provided and includes, in order from the object side, a front group having a negative power, a stop, and a rear group having a positive power. The front group includes, in order from the object side, a first negative lens having a meniscus shape with a concave surface on an image side, a second negative lens, and a third positive lens. The rear group includes, in order from the object side, a fourth positive lens, a fifth negative lens having a meniscus shape with a concave surface on the object side, and a sixth positive lens. An Abbe number of each of the first lens, the second lens, the fourth lens, and the sixth lens at the d-line is equal to or larger than 40, and an Abbe number of each of the third lens and the fifth lens at the d-line is equal to or smaller than 40. Each lens constituting the front group and the rear group is a single lens.

Integrated circuit standby power consumption may be reduced using a reverse-bias transistor control arrangement that reduces transistor leakage current. Integrated circuit transistors may be turned off using a reverse bias voltage rather than a ground voltage. A charge pump circuit on the integrated circuit may be used to generate the reverse bias voltage. The reverse bias voltage may also be provided from an external source. The integrated circuit may be a programmable logic device in which logic is configured by providing programming data to configuration cells. The configuration cells may be used to apply either a positive power supply voltage to a given transistor to turn that transistor on or to provide the reverse bias voltage to that transistor to turn that transistor off.

The invention provides an OLED display device and a luminance compensation method thereof. The OLED display device is provided with a plurality of detection lines, which are connected to a driving chip. Each detection line is connected to a power supply line arranged on a predetermined position through a plurality of switch elements so as to detect the actual positive power supply voltage of pixel units on the predetermined position. The driving chip obtains a data voltage compensation value of at least part of pixel units according to the detected actual positive power supply voltage and one reference positive power supply voltage, and then provides a data voltage to at least part of pixel units according to the data voltage compensation value so as to improve the luminance uniformity of a whole panel.

A control method for transitioning from positive power to engine braking (and vice-versa) is disclosed. This transition may be made using variable valve actuation and two-stroke braking. The process may involve three engine operation modes: positive power (i.e., firing or non-braking), engine braking, and transition between engine braking and positive power. The intake and exhaust valve actuations provided for each of the different modes of operation may be different from each other.

A projection optical system for magnifying an image on a primary imaging plane onto a secondary imaging plane includes a first optical system for forming an intermediate image and a second optical system including a concave reflecting surface disposed between the intermediate image and the secondary plane. The first optical system includes first and second groups respectively having negative and positive power, an aperture, and a third group having positive power from the intermediate image. The surfaces of the first and second optical systems have rotational symmetry about a light axis. A ray traveling from the center of the primary plane to the center of the secondary plane intersects the light axis, is reflected off the reflecting surface, intersects the light axis again, and reaches the secondary plane. The following conditions are satisfied: 0.5<φ1/φ2<3, 1<AST/ASS<5, |AST|/L12<1, and −3<K_rel.