CHARGING AND POWER SUPPLY FOR MOBILE DEVICES

摘要

Charging and power supply for mobile devices is disclosed. A USB-compliant charging and power supply circuit (112) includes switch-mode battery charging circuitry for receiving power from an external power source and for supplying output power through an output node to an electronic system (114) of an electronic communication device and a battery (116). Battery isolation circuitry (208) includes a semiconductor switch (252) connecting the output node to the battery (116). The battery isolation circuitry (208) senses voltage at the output node and variably restricts current to the battery (116) when the voltage is below a minimum voltage value by operationally controlling the semiconductor switch (252) as current passes through it. During variable current restriction the electronic system (114) is supplied required power with said battery (116) being supplied any additional available power.