Patent application number | Description | Published |
20150188426 | POWER SWITCHING DEVICE, THREE PHASE BRIDGE INVERTER, AND METHOD OF OPERATING A POWER SWITCHING DEVICE - A power switching device connected or connectable between a power supply and a load is described. The device may have at least two different operating states, each operating state having a different level of said output voltage associated with it. The power switching device may comprise: a power terminal connected or connectable to said power supply; a load terminal connected or connectable to said load, for providing said output voltage; a power switch connected between said power terminal and said load terminal and arranged to be conductive in a first one of said operating states; a power conductor connected between said power terminal and said load terminal in at least one of said states, wherein an electrical current through said power conductor changes in response to said power switch being turned off, thereby causing self-induction in said power conductor; and a control unit arranged to control said power switch in real-time on the basis of a real-time level of said voltage across said power conductor so as to turn off said power switch in a continuous or stepwise or pulsed manner to prevent a voltage across said power conductor from exceeding a maximum allowed level. A three-phase bridge inverter and a method of operating a power switching device are also described. | 07-02-2015 |
20150234415 | METHOD AND APPARATUS FOR PROVIDING ELECTRICAL ISOLATION - An isolation circuit arranged to provide electrical isolation between at least one control module and at least one driver module. The isolation circuit comprises at least one boost circuit arranged to receive at least one control signal from the at least one control module, and boost the at least one control signal from a first voltage level signal to an increased voltage level signal. The isolation circuit further comprising at least a first capacitive isolation component comprising a first electrically conductive element and at least one further electrically conductive element formed from at least a part of printed circuit board layer, the first and at least one further electrically conductive elements being electrically isolated with respect to one another and arranged to comprise capacitive characteristics there between. | 08-20-2015 |
20150280706 | SELF-POWERED GATE DRIVE CIRCUIT APPARATUS AND METHOD - A self-powered gate drive circuit comprising a first capacitor electrically coupled to a power semiconductor collector node of the circuit; a first switch arranged between the first capacitor and a second capacitor, the first switch electrically coupling the first and second capacitors when switched on; the second capacitor; a first diode, the first diode anode electrically coupled to the first capacitor and the first diode cathode electrically coupled to the first switch; a second diode, the second diode cathode electrically coupled to the first capacitor and the second diode anode electrically coupled with a ground node of the circuit; and a second switch, wherein the second switch electrically couples the second capacitor with a power semiconductor gate node when switched on. | 10-01-2015 |
20150288356 | METHOD AND APPARATUS FOR DRIVING A POWER TRANSISTOR GATE - A gate drive circuit includes a first switch electrically coupled to a single-supply input voltage node, the first switch electrically coupling the voltage node with a first capacitor if switched on; a second switch electrically coupled to a ground node, the second switch electrically coupling the first capacitor with the ground node if switched on; and the first capacitor. A first capacitor lead of the first capacitor is electrically coupled to the first and second switches and a second capacitor lead of the first capacitor is arranged to connect with a power transistor gate. | 10-08-2015 |