3033results about How to "Easy to adjust" patented technology

Angle-adjusting apparatus for a housing of headrest display

InactiveUS20070057541A1Improve viewing angleEasy to adjustStoolsVehicle componentsInterior spaceDisplay device
An angle-adjusting apparatus for a housing of a headrest display, comprising an external housing having an opening at the outer side thereof, a cavity being formed and two sleeves being symmetrically arranged at both sides thereof, a spring element being provided at a top and a bottom side of the cavities, the spring element having a first projecting rib longitudinally extending at an internal side thereof; an internal housing having a front and a rear portion with an internal room for installing a display, a groove and two positioning sleeves corresponding to the cavities of the external housing being disposed at both sides of the internal housing, the internal housing further having a plurality of second projecting ribs at a position corresponding to the spring element; and a left link element and a right link element formed in a symmetric manner and received within the cavities of the external housing, respectively. Each of the left and right link elements includes an external and internal link portion both of which are locked on the external and internal housings, respectively, for a pivotal connection. And the joining end is limited to the lowest point so that a room is reserved to install the display in the small headrest. Moreover, the contact at both sides includes a plurality of engaging and positioning points to allow for a precise angle-adjustment and to protect from loosening due to the rocking action when driving. Accordingly, an optimal view angle can be achieved.

Method for controlling balance of direct current side of cascaded grid-connected inverter based on zero sequence and negative sequence voltage injection

The invention discloses a method for controlling the balance of a direct current side of a cascaded grid-connected inverter based on zero sequence and negative sequence voltage injection. The method is based on the combination of zero sequence voltage and negative sequence voltage injection; and the method comprises the following steps of (1) integrally controlling the direct current voltage by using a control method of positive sequence current decoupling, and correcting the unbalance of the system on the basis of positive sequence decoupling, and decomposing network voltage and the positive and negative sequence of the current by using a second harmonic filtering method; and (2) controlling the phase balance of the direct current side, respectively calculating the zero sequence voltage component and the negative sequence voltage component needing injecting, starting the zero sequence voltage injection method under a normal condition, and using the negative sequence voltage injection method when the power difference of each phase is large according to switching conditions. Furthermore, when the zero sequence voltage injection is used, the condition that the maximum output phase voltage does not exceed the maximum value provided by the inverter needs to be satisfied. Through the method, three phases can be comprehensively combined; the voltage of different phase sequences can be injected under different conditions, the output performance and interphase power adjustment ability of the device are both considered; and for the application of three-phase cascaded grid-connected inverter matched renewable energy sources large-scale synchronization and large-scale energy storage, the method has an important value.
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