Abstract:
A module mount for use in electrically and mechanically mounting an encapsulated power rectifier module, having a plurality of rigid leads protruding from a major mounting surface thereof, in an orientation in which the major mounting surface is substantially normal with respect to a substantially planar circuit board. In one embodiment, the module mount includes (1) a substantially planar substrate having a plurality of apertures located to register with the plurality of rigid leads and (2) a plurality of power conductors, associated with the plurality of apertures, that electrically couple the plurality of rigid leads to an edge interface on the substrate, the edge interface adapted to be coupled to the circuit board.
Abstract:
In a power converter having a power train that includes a power switch and a rectifier for conducting forward currents from the power switch, a circuit for, and method of, reducing switching losses associated with the power train. The circuit includes: (1) an auxiliary switch and an inductor coupled to the power train that reduce a switching loss associated with the power switch and (2) an impedance element series-coupled to the rectifier that reduces a change in current through the rectifier thereby decreasing a reverse recovery current flowing therethrough.
Abstract:
An annular device includes an annular main body, a battery mounting portion, and a battery cover. The battery mounting portion protrudes from an inner surface of the main body, and includes a first arcuate element and a second arcuate element opposite to each other. The battery cover is operable to clasp the battery mounting portion, and includes a first arcuate member and a second arcuate member opposite to each other. The first arcuate member clasps the first arcuate surface, and the second arcuate member clasps the second arcuate surface.
Abstract:
Use of a racemate of pinocembrin, a racemate of pinocembrin salt, a racemate of pinocembrin precursor or a racemate of pinocembrin hydrate in manufacture of a medicament for prophylaxis and treatment of stroke. Particularly, use of pinocembrin racemate in manufacture of a medicament for treatment of acute ischemic stroke.
Abstract:
The present invention provides a methods and compositions for treating a host afflicted with a viral infection, particularly a Flaviviridae infection, including hepatitis C infection, comprising administering an effective antiviral amount of a derivative of andrographolide alone or in combination or alternation with another antiviral compound.
Abstract:
An asymmetrical power converter and method of operation thereof. In one embodiment, the asymmetrical power converter includes (1) an isolation transformer having series-coupled first and second primary windings providing differing turns ratios therefrom, (2) a first power switch and a first input capacitor series-coupled to the first primary winding to form a first circulation path between the isolation transformer and an input of the asymmetrical power converter and (3) a second power switch and a second input capacitor series-coupled to the second primary winding to form a second circulation path between the isolation transformer and the input.
Abstract:
An electromagnetic interference (EMI) filter, method of manufacturing therefor and power converter employing the EMI filter. In one embodiment, the EMI filter includes (1) a filter circuit board located outside a chassis and having an aperture that receives therethrough a bus bar extending from within the chassis, (2) a capacitor, mounted on the filter circuit board and coupled to the bus bar, that receives from the bus bar at least a portion of EMI induced into the bus bar from within the chassis and (3) a conductor, mounted on the filter circuit board and coupled between the capacitor and the chassis, that receives the portion from the capacitor and returns the portion to ground via the chassis.
Abstract:
For use with a power converter coupled to a regulation circuit and having a power switch and an auxiliary switch coupled thereto, a controller, method of operating the power switch and auxiliary switch and a power converter employing the controller and method. In one embodiment, the controller includes a voltage conditioning network, parallel-coupled to the power switch, capable of sensing a voltage across the power switch and developing a conditioned voltage. The controller further includes a drive circuit, coupled to the voltage conditioning network, adapted to provide a drive signal to control the auxiliary switch as a function of the conditioned voltage and a regulation control signal from the regulation circuit.
Abstract:
For use with a protection circuit having an in-rush current control element that controls in-rush current into a power converter, a control circuit, a method of controlling the in-rush current control element and a power supply employing the control circuit and method are provided. In one embodiment, the control circuit includes: (1) a sensor, coupled to the in-rush current control element, that senses an in-rush current through the in-rush current control element and produces an intermediate signal and (2) a controller, coupled to the sensor and the in-rush current control element, that controls the in-rush current control element to limit the in-rush current when the intermediate signal exceeds a first reference current signal and to substantially interrupt the in-rush current when the intermediate signal exceeds a second reference current signal.
Abstract:
An asymmetrical half-bridge converter, a method of operating the same and a power supply that incorporates either the converter or the method. In one embodiment, the converter includes: (1) a power transformer that receives AC input power into a primary winding thereof and transfers the AC input power into first and second secondary windings thereof, the first secondary winding having a secondary to primary turns-ratio smaller than the second secondary winding, (2) an auxiliary inductor coupled across the first and second secondary windings and (3) first and second rectifying diodes having inputs coupled to outer taps of the first and second secondary windings, an output of the converter derived from outputs of the first and second rectifying diodes and a center tap between the first and second secondary windings, an average current in the first secondary winding increased to cause the first and second secondary windings and the auxiliary inductor to share a DC bias current developed in the converter during an operation thereof.