94results about How to "Wide load range" patented technology

The various embodiments and example provided herein are generally directed to novel multiphase resonant converters. In an embodiment, a multiphase resonant converter comprises N unit resonant converters having inputs and outputs connected in parallel, respectively. Each unit converter comprises an inverter, a LLC series resonant tank, and a rectifier. In a preferred embodiment, the inverters of the N unit converters are driven by N drive signals phase-shifted 2π / N degrees apart. During operation, the current of the multiphase converter is shared among the unit converters, resulting in a smaller current in each unit converter. The smaller current in each unit converter reduces conduction losses, thereby increasing the efficiency of the multiphase converter. In addition, the smaller current in each unit converter reduces the amount of stress placed on individual components of the converter allowing for the use of lower tolerance components. Further, the multiphase converter has automatic current sharing ability.

In a method for the combustion of a fuel, a fuel or a premixed combustible mixture is introduced into a combustion space as a combustible fluid open jet. The velocity of the open jet is selected in such a way that it is impossible for a stable flame front to form, i.e. is in any event greater than the flame front velocity, and that, on account of a jet pump effect, flue gas is mixed into the combustible fluid jet from the combustion chamber in a jet-induced recirculation internally within the combustion chamber. The admixed flue gas dilutes and heats the combustible fluid. The heating causes the spontaneous ignition temperature to be exceeded, and a low-pollutant volumetric flame is formed in a highly dilute atmosphere.

A control system for a catalytic combustion system on a gas turbine includes a flame preburner, a fuel injector positioned downstream of the preburner and a catalyst positioned downstream of the fuel injector. In such systems, a portion of the fuel combusts within the catalyst itself and the remainder of the fuel combusts in a homogeneous combustion process wave downstream of the catalyst. A sensor in communication with the control system monitors the homogeneous combustion process wave and adjusts the gas temperature at the catalyst inlet to a preferred value based on a predetermined schedule that relates the catalyst inlet gas temperature to operating fundamentals such as adiabatic combustion temperature or the gas turbine's exhaust gas temperature.

Light load efficiency of a power factor correction circuit is improved by adaptive on-time control and providing for selection between a continuous conduction mode and a discontinuous conduction mode wherein the discontinuous conduction mode increases time between switching pulses controlling connection of a cyclically varying voltage to a filter / inductor that delivers a desired DC voltage and thus can greatly reduce the switching frequency at light loads where switching frequency related losses dominate efficiency. The mode for controlling switching is preferably selected for each switching pulse within a half cycle of the cyclically varying input voltage. A multi-phase embodiment allows cancellation of EMI noise at harmonics of the switching frequency and adaptive change of phase angle allows for cancellation of dominant higher order harmonics as switching frequency is reduced.

The invention relates to a compound excitation permanent magnet synchronous generator for electric vehicles. An auxiliary electric excitation winding and built-in V-shaped magnetic steel are arrangedin a rotor iron core in the circumferential direction; the built-in V-shaped magnetic steel and a pole shoe form a permanent magnet pole, and the auxiliary electric excitation winding and an interwinding iron core form an excitation pole; the permanent magnet and the auxiliary electric excitation winding together generate armature induction potential, the air gap magnetic field can be adjusted conveniently by adjusting the magnitude and the direction of the DC excitation current in the electric excitation winding, and the purposes of high efficiency, energy saving and high-precision adjustmentof the voltage at an output end are achieved; meanwhile, the permanent magnet rotor is made of the V-shaped segmented magnetic steel, and holes are arranged in the pole shoe to lighten the weight ofthe rotor to avoid the high-speed deformation of the rotor; a groove is formed at the center of the pole shoe in the radial direction, and nonmagnetic good conductors are filled in the groove; and magnetism isolating grooves are arranged at two ends of the V-shaped magnetic steel, thereby inhibiting the static and dynamic armature reaction, improving the output voltage waveform, increasing the airgap magnetic density, reducing the magnetic leakage and increasing the output power. The compound excitation permanent magnet synchronous generator can smoothly operate at high power density, speed and precision.

The various embodiments and example provided herein are generally directed to novel multiphase resonant converters. In an embodiment, a multiphase resonant converter comprises N unit resonant converters having inputs and outputs connected in parallel, respectively. Each unit converter comprises an inverter, a LLC series resonant tank, and a rectifier. In a preferred embodiment, the inverters of the N unit converters are driven by N drive signals phase-shifted 2π / N degrees apart. During operation, the current of the multiphase converter is shared among the unit converters, resulting in a smaller current in each unit converter. The smaller current in each unit converter reduces conduction losses, thereby increasing the efficiency of the multiphase converter. In addition, the smaller current in each unit converter reduces the amount of stress placed on individual components of the converter allowing for the use of lower tolerance components. Further, the multiphase converter has automatic current sharing ability.

Disclosed is an engine control system which is designed to allow homogeneous-charge compression ignition combustion to be performed in an HCCI region (R) defined as an engine operating region including at least a partial-load range of an engine. In a low load zone (R1) of the HCCI region (R), a lift amount of an intake valve (11) is set to a first predetermined value, and an exhaust valve (12) is allowed to start being opened during an intake stroke at a given timing later than an opening timing of the intake valve (11). Further, in the medium load zone of the HCCI region, the lift amount of the intake valve (11) is gradually increased up to a second predetermined value greater than the first predetermined value, along with an increase in an engine load. The engine control system is capable of adequately controlling an amount of burned gas to be introduced into a cylinder, depending on the engine load to allow the HCCI combustion to be adequately performed in a wider engine load range.

The invention discloses a frequency conversion control method of an independent charging and discharging timing sequence single-inductance double-output switching converter and a frequency conversion control device. Control on a main switch tube and a branch switch tube of the converter is finished through limiting the amplitudes of a capacitive current peak and a capacitive current valley, and independent adjustment on various output branches is achieved. Compared with a traditional independent charging and discharging timing sequence single-inductance double-output switching converter, the independent charging and discharging timing sequence single-inductance double-output switching converter disclosed by the invention has the advantages of being good in stability, high in reliability, wide in load range, high in anti-jamming capability, high in input and load transient response speeds, small in cross influence among the output branches and the like, and can be used for controlling various converters, such as a Buck converter, a Boost converter, a Buck-boost converter, a Bipolar converter and the like, with a single-inductance double-output topological structure.