Vpt, Inc.

Stephen J Butler

Wei P Chen

Guichao Hua

Daniel M Sable

Anthony G Salamone

Electronic module with all-sided electromagnetic interference (EMI) shielding and methods of making same. The electronic module includes an encapsulated circuit board between a top plate and a conductive bottom plate, electrical leads extending from the circuit board through the bottom plate, and a continuous conductive coating substantially covering the entire electronic module except for a bottom surface of the bottom plate. The conductive coating forms direct, independent connections at least to the circuit board and the bottom plate. The conductive coating provides EMI shielding across the top and sides of the electronic module. The conductive bottom plate provides EMI shielding across the bottom of the electronic module. Methods of manufacturing include encapsulating a circuit board between a top plate and bottom plate, separating materials from the encapsulated circuit board to expose conductive traces on the circuit board and bottom plate, and coating the sawed device with a conductive coating.

Electronic module and method of making same

A power converter using a switching signal having at least three levels of amplitude, one of which amplitude levels has a zero amplitude level during a predetermined switching interval, is provided. The power converter includes a circuit module having first and second input terminals for receiving the switching signal. The circuit module in turn is made up of a first power transistor and second power transistor. Circuitry is electrically coupled to a predetermined one of the power transistors for maintaining a predetermined voltage level across the gate terminal of the predetermined one of the power transistors during the switching interval of zero amplitude. The predetermined voltage level is chosen to enable that predetermined power transistor to continue in a respective 'on' state notwithstanding of the presence of the switching interval of substantially zero amplitude. The circuitry further allows for removing or discharging the predetermined voltage upon termination of the switching interval of zero amplitude level to enable the predetermined power transistor to transition to a respective 'off' state. The power converter may be conveniently used to extend a self-driving synchronous rectification technique to a broader range of output voltages and circuit topologies and provides over-voltage protection to the gates power transistors, and the capability to directly parallel additional modules.

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Warrenton, VA, United States of America

Stephen J Butler