ADAPTIVE BOOSTING OF RECTIFIED VOLTAGE IN A WIRELESS CHARGING SYSTEM

A wireless power receiver (13') includes a rectifier with first (N2) and second (N4) inputs coupled to first and second terminals of a receiver coil (Ls), and having a first output (N1) coupled to ground and a second output (N3) at which a rectified voltage (Vrect) is produced. A first switch (...

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Bibliographische Detailangaben
Hauptverfasser:	CHEONG, Chee Weng, TAN, Kien Beng
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION SYSTEMS FOR STORING ELECTRIC ENERGY
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Beschreibung
Zusammenfassung:	A wireless power receiver (13') includes a rectifier with first (N2) and second (N4) inputs coupled to first and second terminals of a receiver coil (Ls), and having a first output (N1) coupled to ground and a second output (N3) at which a rectified voltage (Vrect) is produced. A first switch (SW1) is coupled between the second input (N4) and ground, and is controlled by a first gate voltage (Vgatel) generated at a first node (N5). A second switch (SW2) is coupled between the first node (N5) and ground, and is controlled by a second gate voltage (Vgate2). The first gate voltage (Vgatel) closes the first switch (SW1) to couple the second input (N4) to ground when the rectified voltage (Vrect) is less than a threshold voltage, boosting the rectified voltage. The second gate voltage (Vgate2) closes the second switch (SW2) to cause the second gate voltage (Vgate2) to be pulled to ground when the rectified voltage (Vrect) is greater than the threshold voltage, limiting the boosting of the rectified voltage.