346 results about "Phase converter" patented technology

The present invention is a method and system for efficiently converting an alternating current (AC) supply to a direct current (DC) output. A power supply in accordance with the present invention may employ variable frequency constant on-time converters whereby switching losses of the converters are approximately proportional with a switching frequency, causing the power supply to be more efficient at light loads. Additionally, a power supply in accordance with the present invention may include multiple-phase converters in which each phase is designed for operation at a fraction of the total maximum load for the power supply.

A clock signal generator having a pre-phase converter for generating in response to an input clock signal a plurality of pre-delay clock signals with different phases; and main phase converters each of which receives one of the pre-delay clock signals, and generates a plurality of main delay clock signals with their phases different from each other, thereby generating multiple main delay clock signals with their phases different from each other.

A variable valve timing control system of an internal combustion engine includes a hydraulically-operated phase converter disposed between a sprocket and a camshaft, and having a phase-advance hydraulic chamber and a phase-retard hydraulic chamber for changing an angular phase of the camshaft relative to the sprocket. An electric pump is provided to supply working fluid selectively to one of the hydraulic chambers via a directional control valve. Also provided is a check valve disposed in a discharge line of the pump for permitting flow in a direction that the working fluid flows from the pump to the directional control valve and preventing any flow in the opposite direction, so as to prevent a pulse pressure arising from alternating torque exerted on the camshaft from being transmitted from either one of the hydraulic chambers via the discharge line to a discharge port of the pump.

An asynchronous protocol converter, which is capable of flexibly carrying out communications between tens of IP cores in an asynchronous protocol Network-on-Chip system, and which is multiple input multiple output is provided. In an LSI (20), which comprises a plurality of IP cores (21), and routers (22) positioned adjacent to the plurality of IP cores (21), an asynchronous protocol converter (1) is positioned between adjacent routers (22). The asynchronous protocol converter (1) is configured to comprise: a two-to-four-phase converter (11) that is connected to an adjacent router (22a) within the LSI (20); a four-phase pipelined router (12) that is connected on the output side of the two-to-four-phase converter (11); a four-to-two-phase converter (13) that is connected to the outputs of the four-phase pipelined router (12); an input controller (14) that controls the two-to-four-phase converter (11); and an output controller (15) that controls the four-to-two-phase converter (13).

The invention discloses an electromagnetic transient mathematical model of a distributed power-flow controller based on an MMC, control system and a modeling method. The distributed power-flow controller comprises a parallel connection side converter composed of a three-phase converter based on the MMC at the parallel connection side and a parallel connection side single-phase converter and a series connection side converter composed of multiple sets of series connection side single-phase converter; the electromagnetic transient mathematical model mainly comprises a parallel connection side converter model and a series connection side converter model; the control system comprises a parallel connection side control model and a series connection side control model, the parallel connection side control model comprises a three-phase converter control module based on the MMC at the parallel connection side and a parallel connection side single-phase converter module, and the series connection side control model comprises a series connection side third harmonic control module and a series connection converter active power reactive power control module. The electromagnetic transient mathematical model is designed by adopting modularization, the sub module switch-on and switch-off frequency is lowered, and the loss is lowered; the control system adapts to different voltage grades, and is applicable to flexible alternating current transmission occasions.

In a communication system using the time diversity transmission scheme, the communication system provided with the stable automatic frequency control circuit with the wide frequency pull-in range and under low CN ratio transmission is achieved by removing the modulation phase from the received data through the application of the data correlation of the time diversity. The frequency offset in the received signal is compensated as the phase rotator rotates the phase of the received signal, the phase converter converts the phase rotator output into a phase, the serial-to-parallel converter converts the phase converter outputs into serial-to-parallel sequence, the delay units gives a delay to the serial-to-parallel converter output, the phase adder adds the serial-to-parallel converter output to the delay unit output, the multiplier multiplies the phase adder output by a certain value, the integrator integrates the multiplier output, another integrator integrates the integrator output, and the phase rotator controls the phase of the received signal based on the other integrator output.

An image rejection mixer includes an input terminal for receiving an input radio frequency (RF) signal, a mode selector coupled to the input terminal generating an output signal for either high side mixing or low side mixing, a first mixer coupled to receive the input RF signal and a signal from a local oscillator providing a signal having a local oscillator frequency, a phase converter coupled to convert the phase of the signal from the local oscillator, a second mixer coupled to receive the output signal from the mode selector and the phase-converted local oscillator signal, and a tunable polyphase filter coupled to receive output signals from the first mixer and the second mixer, the tunable polyphase filter providing an output signal having a variable intermediate frequency. In one embodiment, the variable intermediate frequency the tunable polyphase filter is implemented as a switchable intermediate frequency.

In a valve timing control apparatus configured to execute phase-control via a phase converter, a controller is configured to control a phase angle of a camshaft relative to a crankshaft during an engine stopping period to a target phase angle differing from a required phase angle suited for an engine operating condition. The controller is further configured to change the phase angle of the camshaft toward the required phase angle during a time period from a point of time when cranking starts to a point of time when detection of a rotational position of the camshaft initiates during an engine restarting period. The controller is still further configured to start feedback-control for the phase angle of the camshaft from the point of time of initiation of detection of the rotational position of the camshaft for bringing the phase angle of the camshaft closer to the required phase angle.

The invention relates to an electrified railway electric energy quality compensating device which comprises an alpha-phase converter bridge arm, wherein the alpha-phase converter bridge arm is connected with the alpha-phase power supply arm of a traction transformer through a reactor (LA); one end of the alpha-phase converter bridge arm is connected with one end of a capacitor through a direct current positive bus, and the other end is connected with one end of the other capacitor through a direct current negative bus; the midpoint of the serial connection part of the other ends of the two capacitors is used as a neutral point; the neutral point is connected with a traction power supply neutral line through a reactor (LO); the direct current positive bus and the direct current negative bus are simultaneously connected with a beta-phase converter bridge arm, and the beta-phase converter bridge arm is connected with the beta-phase power supply arm of the traction transformer through a reactor (LB); and a single-phase circuit comprising the traction power supply neutral line and the alpha-phase or beta-phase converter bridge arm is connected with the single-phase circuit comprising the traction power supply neutral line and the alpha-phase or beta-phase power supply arm, the current flowing through the reactor (LA) or (LB) is regulated and controlled by regulating the amplitude and the phase position of the output voltage of the alpha-phase or beta-phase converter bridge arm, and dynamic power compensation and harmonic filtering are carried out for the alpha-phase or beta-phase power supply arm. The invention is mainly used for improving the electric energy quality of an electrified railway power supply network and also can be used for similar single-phase power supply networks.

A phased array antenna system with variable electrical tilt comprises an array (60) of antenna elements (60L1) etc. incorporating a divider (44) dividing a radio frequency (RF) carrier signal into two signals between which a phase shifter (46) introduces a variable phase shift. A phase to power converter (50) converts the phase shifted signals into signals with powers dependent on the phase shift. Power splitters (52, 54) divide the converted signals into two sets of divided signals with total number equal to the number of antenna elements in the array. Power to phase converters (561) etc. combine pairs of divided signals from different power splitters (52, 54) this provides vector sum and difference components with appropriate phase for supply to respective pairs of antenna elements (60U1, 60L1) etc. located equidistant from an array centre. Adjustment of the phase shift provided by phase shifter (46) changes the angle of electrical tilt of the antenna array (60).