Linear charger and method for controlling charging current

The invention provides an NMOSFET-based linear charger. A source electrode of a sensing NMOSFET is coupled with a source electrode of a charging NMOSFET, or the source electrode of the charging NMOSFET is coupled with the source electrode of the sensing NMOSFET, so that the sensing NMOSFET and the c...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	GONG NENGHUI, ZHU GUANREN
Format:	Patent
Sprache:	chi ; eng
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:	The invention provides an NMOSFET-based linear charger. A source electrode of a sensing NMOSFET is coupled with a source electrode of a charging NMOSFET, or the source electrode of the charging NMOSFET is coupled with the source electrode of the sensing NMOSFET, so that the sensing NMOSFET and the charging NMOSFET have the same switch source electrode differential voltage, therefore, drain sourceelectrode current generated by the sensing NMOSFET responds to drain source electrode current generated by the charging NMOSFET, then a current sensing signal is generated by the drain source electrode current generated by the sensing NMOSFET and is used for controlling the switch electrode voltage of the charging NMOSFET. As NMOSFET is taken as a charging MOSFET, the area of the chip of the charging MOSFET can be greatly reduced.