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813results about How to "Improve power conversion efficiency" patented technology

Electrothermal composite ceramic brick and preparation method thereof

The invention discloses an electrothermal composite ceramic brick and a preparation method thereof. An electrothermal coating layer, a guiding-out wiring electrode, a coating insulation packaging waterproof layer and an application foaming ceramic layer coat an unglazed surface of a ceramics substrate in order. The electrothermal coating layer coats the unglazed surface of the ceramics substrate in an electrothermal slurry form, the electrothermal slurry permeates the green body of the ceramics substrate, and the penetration depth is less than the thickness of the ceramics substrate and more than 0.5mm. Because of the penetration, the electrothermal coating layer of the electrothermal composite ceramic brick is combined with the ceramics substrate tightly, a surface heating mode is achieved, the thermal efficiency is high, normal and safe usage can be achieved under a voltage of 24-380V, the heating power is 90-120w / m<2>, and the temperature of the ceramics substrate can reach 18-50 DEG C through a temperature control device. The insulation packaging waterproof layer and the foaming ceramic layer outside the electrothermal coating layer can prevent heat from outward transmission effectively, heat loss is lowered, and the whole safety and reliability of the ceramic brick are raised.
Owner:GUANGDONG TIANBI CERAMICS

Large-power intelligent dimming multiple-output power supply for suppressing electric surge with field-effect transistor

The invention provides a large-power intelligent dimming multiple-output power supply for suppressing electric surge with a field-effect transistor. The power supply comprises an electric surge suppression unit, an LLC (Inductor-Inductor-Capacitor) resonance conversion unit, a synchronous rectification unit and more than one constant-current-output intelligent dimming unit, wherein a power resistor in the electric surge suppression unit is connected in parallel with the source electrode and the drain electrode of a field-effect transistor, and the loss of an electric surge suppression circuit is very low due to the extremely small on-resistance of the field-effect transistor so that the whole efficiency of the power supply is improved. The invention acquires the output efficiency up to 95 percent by the optimization design of parameters of an LLC resonance network, the constant-current-output intelligent dimming unit circuit of the invention increases the mean value of the output current by increasing the duty cycle of an output current when sensing infrared rays of a human body; and otherwise, the constant-current-output intelligent dimming unit circuit decreases the duty cycle of the output current but not decreases the peak value while no body passes by so as to ensure LED luminous power and prevent light from scattering over the ground.
Owner:DONGGUAN SHILONG FUHUA ELECTRONICS

Permanent magnetic direct-drive type offshore wind power plant grid-connected system topology structure and control method thereof

The invention discloses a permanent magnetic direct-drive type offshore wind power plant grid-connected system topology structure and a control method thereof. A grid-connected system comprises a DC bus current collection type wind power plant, a wind field network-side converter station, a dual-stage boost transformer, an offshore rectification station, a seabed DC cable, a shore inversion station, a grid-connected side boost transformer and a land power grid which are successively connected, wherein the DC bus current collection type wind power plant employs a DC bus current collection topology structure and comprises multiple groups of wind turbines which are successively connected, a permanent magnetic synchronous generator, a machine-side rectifier and a DC bus for current collection. The control method is that the machine-side rectifier employs dual-closed-loop control of a rotating speed outer loop and a current inner loop, the wind field network-side converter station employs dual-closed-loop control of a voltage outer loop and the current inner loop, the offshore rectification station employs control of fixed AC voltages and fixed frequencies, and the shore inversion station employs dual-closed-loop control of fixed DC voltages and fixed reactive power. According to the invention, multi-machine parallel-connected operation can be realized, the electric energy conversion efficiency is improved, and the grid-connected AC harmonic quantity is reduced.
Owner:HOHAI UNIV

Energy-storage voltage-balanced power electronic electric energy converting system and control method thereof

The invention provides an energy-storage voltage-balanced power electronic electric energy converting system and a control method thereof. The energy-storage voltage-balanced power electronic electric energy converting system is composed of an energy storage module, a voltage-balanced converter, a power-grid-side inverter, a power grid load, an energy-storage-side inverter and an independent load. Through control over the high-frequency soft-switching voltage-balanced converter, balanced control over an energy storage unit or module is realized, the service life of energy storage equipment is prolonged, the use cost is reduced, and meanwhile, multiple routes of isolation direct voltage are provided for the power-grid-side inverter. The energy storage unit or module is charged and discharged through the electric energy converting system, electric isolation of energy storage and a power grid is realized, interaction is formed with the power grid, and the purposes of peak load shifting, harmonic suppression and reactive compensation are realized. The energy-storage voltage-balanced power electronic electric energy converting system is realized through modularized design and has the advantages that electric isolation of the power grid and the energy storage side is realized, control is simple, the size is small, the efficiency is high and the cost is low.
Owner:张良华 +1

Floating breakwater doubling as wave power generation device

The invention relates to the technical field of breakwater engineering and wave power generation, in particular to a floating breakwater generation device arranged in open sea. The floating breakwater generation device comprises floating members, air turbine generator sets, air chambers, airflow passages, mooring systems and signal transmission devices, and is characterized in that the floating members are respectively connected with concrete anchor blocks at the sea bottom through anchor chains; a plurality of wave dissipating perforations penetrating through a floating body are formed in the head-sea face of each floating member; the air turbine generator sets are respectively arranged in the airflow passages; the floating bodies are driven by waves to vertically move, so that water in the air chambers vibrates and air in the air chambers is pushed to move, and the air turbine generator sets are further driven to generate electricity. The floating breakwater generation device disclosed by the invention has the characteristics of being stable in structure, low in erection cost, high in generation conversion efficiency, convenient to maintain, and the like, and can be applied to sea areas with deep water, high waves and complex terrain; while wave impacts are weakened and a steady water area environment is provided for surrounding water areas, the waves can be converted into electric energy, and the electric power supply problem of harbor district or island residents is effectively solved.
Owner:CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Bidirectional direct current converter based on immittance network, and digital control system and method of bidirectional direct current converter

The invention discloses a bidirectional direct current converter based on an immittance network, and a digital control system and a digital control method of the bidirectional direct current converter. The bidirectional direct current converter based on the immittance network comprises a storage battery, a low-voltage-side filter capacitor, a first active full-bridge circuit, the immittance network, a high-frequency transformer, a second active full-bridge circuit and a high-voltage-bus-side filter capacitor. The digital control system comprises a first voltage sensor, a second voltage sensor, a current sensor and a digital signal processing (DSP) digital controller, wherein the DSP digital controller comprises a BUCK controller, a BOOST controller, a signal conditioner, a first selective switch and a second selective switch. According to the basic characteristics of the immittance network, the two active full-bridge circuits in the bidirectional direct current converter can operate with high power factor, and the current stress of a switching tube can be greatly reduced. By the adoption of the system and the method, according to the characteristics of the immittance network, the zero-current turn on and zero-current turn off of all switching devices of a high-voltage-side active full-bridge circuit are realized, and the efficiency of the converter is improved.
Owner:YANCHENG INST OF TECH
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