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2585results about How to "Reduce pollution" patented technology

Drive circuit capable of improving power factors of alternating current light emitting diode (AC LED) lamp

The invention discloses a drive circuit capable of improving power factors of an alternating current light emitting diode (AC LED) lamp. The drive circuit comprises a rectifier bridge, wherein two input terminals of the rectifier bridge are connected with AC voltage. The drive circuit is characterized in that: the positive output terminal of the rectifier bridge is connected with positive terminals of n serially connected LED lamp strings and detection terminals of n self-controlled constant-current circuits; the negative output terminal of the rectifier bridge is connected with the output terminals of the n self-controlled constant-current circuits; the negative terminal of the nth LED lamp string is connected with the input terminal of the self-controlled constant-current circuit with serial number of n, wherein n is more than or equal to 2 but less than or equal to 10; and in the n serially connected LED lamp strings, the number of LEDs in each lamp string is the same. The drive circuit uses a circuit design method of automatically controlling operating modes of the n constant-current circuits in stages by detecting AC input voltage so as to greatly improve the power factor, reliability and safety of the AC LED; and an AC/DC converter is not needed to be installed in the lamp, and then the failure rate of equipment is reduced. Furthermore, the drive circuit has the advantages of novel structure, simple circuit, high power factor, long service life, good power-saving effect and the like.
Owner:NO 771 INST OF NO 9 RES INST CHINA AEROSPACE SCI & TECH

Distributed energy comprehensive utilization system for biomass energy and solar energy

The invention relates to a distributed energy comprehensive utilization system for biomass energy and solar energy, which comprises a biomass gasifying device, a methane generating device, a solar thermal collector, a solar photovoltaic generating device and a gas-steam combined cycle generating device, wherein biomass gas is supplied to a gas turbine set for generating power, exhaust gas of the gas turbine is supplied to an exhaust-heat boiler, major steam of the exhaust-heat boiler is supplied to a steam turbine set for generating power, and exhaust gas of the exhaust-heat boiler is used asa main heat source of the methane generating device; the solar thermal collector supplies hot water serving as a heating heat source and a standby heat source of the methane generating device, the hot water of the solar thermal collector is converted into high-temperature heating medium water through an auxiliary heater to drive a refrigerator to refrigerate, a heat source of the auxiliary heateris from part of high-temperature exhaust gases of the gas turbine, and the exhaust of the gas turbine is used as an additional heat source of the methane generating device; methane is used for cooking; and the solar photovoltaic generating device provides electric energy for communal facilities. The distributed energy comprehensive utilization system realizes the cascade utilization of the energymeeting multiple requirements of users directly, and relieves environmental pollution caused by energy consumption of eco-villages.
Owner:NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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