CHARGING SYSTEM
A mobile electronic device includes circuitry for contactless charging. The circuitry comprises an inductor for contactlessly receiving power and supplying the power to the mobile electronic device. A control stage coupled to the inductor and is adapted to control a supply of power received by the inductor to the load to regulate a load current such that a supply voltage is maintained above a predetermined level.
1 . An apparatus comprising:
an inductor that is adapted to magnetically coupled to power sourcing circuitry;
a rectifier that is coupled to the inductor and that outputs a direct current (DC) signal;
a protection circuit that is coupled to the rectifier and that is adapted to limit the DC signal; and
a controller that is coupled to the protection circuit, that is adapted to output a system voltage and a system current to a load, and that is adapted to output a charging voltage and a charging current to a battery, wherein the controller adjusts the charging voltage and charging current so that the system voltage is maintained above a predetermined threshold.
2 . The apparatus of claim 1 , wherein the rectifier further comprises a diode bridge.
3 . The apparatus of claim 1 , wherein the protection circuit provides overvoltage protection and limits the voltage of the DC signal.
4 . A system comprising:
power sourcing circuitry having:
a first inductor; and
a switch that is coupled to the first inductor, wherein the first inductor stores energy when the switch is actuated;
a second inductor that is adapted to magnetically coupled to the first inductor, wherein second inductor receives energy from the first inductor when the switch is deactuated;
a rectifier that is coupled to the second inductor and that outputs a direct current (DC) signal;
a protection circuit that is coupled to the rectifier and that is adapted to limit the DC signal; and
a controller that is coupled to the protection circuit, that is adapted to output a system voltage and a system current to a load, and that is adapted to output a charging voltage and a charging current to a battery, wherein the controller adjusts the charging voltage and charging current so that the system voltage is maintained above a predetermined threshold.
5 . The system of claim 4 , wherein the power sourcing circuit further comprises:
an inverter that is coupled to the control electrode of the switch and that generates a pulse width modulated (PWM) signal to actuated and deactuate the switch; and
an RCD network that is coupled to an input of the inverter and to the control electrode of the switch.
6 . The system of claim 5 , wherein the RCD network further comprises:
a capacitor coupled between the input of the inverter and ground;
a first resistor coupled between the control electrode of the switch and the input of the inverter;
a second resistor coupled to the input of the inverter; and
a diode coupled between the second resistor and the control electrode of the switch.
7 . The system of claim 4 , wherein the power sourcing circuitry further comprises a capacitor that is coupled in parallel to the first inductor.
8 . The system of claim 4 , wherein the rectifier further comprises a diode bridge.
9 . The system of claim 4 , wherein the protection circuit provides overvoltage protection and limits the voltage of the DC signal.