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863 results about "Cycle control" patented technology

One cycle control PFC boost converter integrated circuit with inrush current limiting, fan motor speed control and housekeeping power supply controller

ActiveUS7068016B2Eliminating redundant switching circuitsSimplifies inclusionBatteries circuit arrangementsEfficient power electronics conversionMotor speedCycle control
A power factor corrected boost converter circuit includes a rectifier connectable to an ac input and having a rectified dc output provided across a dc bus, an inductor having first and second terminals connected in one leg of the dc bus, an integrated circuit comprising a control circuit for controlling a switch, the integrated circuit including a housing enclosing the control circuit, the integrated circuit having a power terminal, a ground terminal, a first control input terminal coupled to an output of the converter circuit, and a second control input terminal coupled to a sensor for sensing current in the dc bus and further having an output terminal connected to the switch, a boost rectifier diode having a first terminal, the diode coupled to the inductor, and a storage capacitor connected to the diode. The control circuit comprises a one cycle control circuit having an integrator reset by a clock signal for each cycle of the clock signal. The circuit further includes any or all of an inrush current limiting circuit for limiting the current through the inductor to a value below a predetermined level, a fan motor speed controller and a housekeeping power supply controller.
Owner:INFINEON TECH AMERICAS CORP

Method of inflating, in alternating manner, a support device having inflatable cells, and a device for implementing the method

A method of inflating, in alternating manner, inflatable cells of a support device for supporting an element to be supported is provided, which device is of the mattress type for supporting the body of a patient, said mattress being made up of cells that are inflatable with a fluid, in particular air, and having at least one zone made up of first and second series of inflatable cells referred to respectively as “first” cells and as “second” cells, the cells of each series communicating fluidly with one another and with inflation means, in which method alternating deflation and re-inflation cycles are performed during which each of said series of cells is deflated and then re-inflated in alternation and in succession, said first cells being deflated and then re-inflated simultaneously respectively with the re-inflation and with the deflation of said second cells, the alternating deflation and re-inflation of said first and second cells of the support device taking place in a cycle controlled by said inflation means being switched on/off, wherein the switching on/off of said inflation means is controlled as a function of the values of the pressures of the fluid measured inside said cells and of comparison of said values with at least one reference pressure value determined as a function of the morphology of the patient.
Owner:HILL ROM INDS

Double-tube Buck-Boost type PFC (Power Factor Correction) converter based on one-cycle control

The invention discloses a double-tube Buck-Boost type PFC (Power Factor Correction) converter based on one-cycle control, a bridge rectification circuit is then connected with a BOCBB type double-tube Buck-Boost converter; one path of output signal of a PI (proportion integral) adjuster is sent to a noninverting input end of a comparator, the other path of output signal is superposed with a sampling signal of input current and then is sent to a resettable integrator, an output end of the resettable integrator is connected with an inverting input end of the comparator, an output end of the comparator is connected with an RS (remote sensing) trigger, one end of the RS trigger is connected with a reset switch of the resettable integrator, and a Q-end output signal of the RS trigger simultaneously drives two switching tubes of the BOCBB type double-tube Buck-Boost converter after passing by a driving circuit. The converter disclosed by the invention not only can realize output voltage raising and reducing control, but also can improve a network side power factor, reduces the distortion factor of network entry current, has the advantages of simple structure, high system efficiency and the like and is convenient to control.
Owner:NANTONG UNIVERSITY
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